Publications
| Title | Abstract | Year(sorted ascending) Filter | PMID Filter |
|---|
| cofeeding intra- and interspecific transmission of an emerging insect-borne rickettsial pathogen. | cat fleas (ctenocephalides felis) are known as the primary vector and reservoir of rickettsia felis, the causative agent of flea-borne spotted fever; however, field surveys regularly report molecular detection of this infectious agent from other blood-feeding arthropods. the presence of r. felis in additional arthropods may be the result of chance consumption of an infectious bloodmeal, but isolation of viable rickettsiae circulating in the blood of suspected vertebrate reservoirs has not been d ... | 0 | 26414611 |
| lxxi. the effect of the vapours of various insecticides upon fleas (ceratophyllus fasciatus and xenopsylla cheopis) at each stage in their life history and upon the bed bug (cimex lectularius) in its larval stage. | 1914 | 20474559 | |
| the respective influences of temperature and moisture upon the survival of the rat flea (xenopsylla cheopis) away from its host. | 1924 | 20474832 | |
| the multiplication of the virus of mexican typhus fever in fleas. | the virus of mexican typhus has been shown to multiply abundantly in the following species of fleas: xenopsylla cheopis, ceratophyllus fasciatus, leptopsylla musculi, ctenocephalus canis, ctenocephalus felis. in all fleas, rickettsia prowazeki was demonstrated within the epithelial cells of the stomach and within the cells of the malpighian tubules. whereas in infected lice enormous numbers of these organisms are discharged from the disintegrating cells into the intestinal content, only few rick ... | 1932 | 19869993 |
| occurrence of the oriental rat flea in the interior of the united states. | 1938 | 17752341 | |
| occurrence of the oriental rat flea in columbus, ohio. | 1941 | 17775379 | |
| oriental rat flea established in kansas. | 1941 | 17809698 | |
| a practical method for mass production and transfer of xenopsylla cheopis. | 1946 | 20277199 | |
| tularemia; attempted transmission by each of two species of fleas; xenopsylla cheopis (roths.) and diamanus montanus (baker). | 1946 | 21010807 | |
| sylvatic plague studies: the vector efficiency of nine species of fleas compared with xenopsylla cheopis. | 1947 | 20475778 | |
| the water relations of the larva of xenopsylla cheopis (siphonaptera). | 1948 | 18876889 | |
| transmission of salmonella enteritidis by the rat fleas xenopsylla cheopis and nosopsyllus fasciatus. | 1949 | 18137984 | |
| occurrence of the tropical rat flea (xenopsylla cheopis) in wyoming. | 1950 | 15402966 | |
| the failure of the roenticide warfarin to injure oriental rat fleas when the poison is fed to the host rat. | 1951 | 14889388 | |
| sylvatic plague studies. vii. plague transmission potentials of the fleas diamanus montanus and polygenis gwyni compared with xenopsylla cheopis. | 1952 | 14917888 | |
| status of murine typhus infection in domestic rats in the united states, 1952, and relation to infestation by oriental rat fleas. | 1953 | 13104714 | |
| techniques for rearing and handling body lice, oriental rat fleas, and cat fleas. | the authors describe techniques for handling and rearing large numbers of body lice (pediculus humanus humanus l.), oriental rat fleas (xenopsylla cheopis (rothschild)), and cat fleas (ctenocephalides felis felis (bouché)).body lice may be fed on man or on domestic rabbits. in the latter case, the lice are kept on woollen patches in glass dishes at 30 degrees c and 60% relative humidity. the patches are placed on the clipped belly of a rabbit once a day and the lice allowed to feed. eggs are dep ... | 1954 | 13150173 |
| studies on pasteurella pestis in fleas. ii. experimental blocking of xenopsylla cheopis with an avirulent strain of p. pestis. | 1954 | 13216228 | |
| wild-rodent-flea control in rural areas of an enzootic plague region in hawaii; a preliminary investigation of methods. | preliminary field tests were carried out to develop methods for controlling fleas on wild rodents in the enzootic plague region of the island of hawaii. among several designs, a metal hood-type ddt bait-box was developed which was simple in design, low in cost, easy to transport to and maintain in the field, protected the insecticide from the elements, and attracted all species of field rats inhabiting a gulch in the hamakua district. these rats-rattus rattus (and its subspecies), r. norvegicus, ... | 1955 | 13260882 |
| studies on pasteurella pestis in fleas, comparative plague-vector efficiency of xenopsylla vexabilis hawaiiensis and xenopsylla cheopis. | the authors report on a study carried out to determine the experimental plague-vector efficiency of x. v. hawaiiensis compared with x. cheopis after both species had been infected with a virulent hawaiian plague strain (s113). in deriving the numerical values for vector efficiency the concepts of wheeler and douglas were followed with some modifications. an additional component, the blocking-survival potential, was used to obtain a vector index.the experiments showed that the mean extrinsic incu ... | 1956 | 13356144 |
| studies on pasteurella pestis in various flea species. iii. transmission of avirulent strains of past. pestis by xenopsylla cheopis. | 1956 | 13357775 | |
| studies on pasteurella pestis in fleas. iv. experimental blocking of xenopsylla vexabilis hawaiiensis and xenopsylla cheopis with an avirulent strain. | 1956 | 13365622 | |
| studies on pasteurella pestis in fleas. v. the experimental plague-vector efficiency of wild rodent fleas compared with xenopsylla cheopis, together with observations on the influence of temperature. | 1956 | 13381882 | |
| [toxic effect of ddt on rat flies, xenopsylla cheopis; laboratory data]. | 1957 | 13440401 | |
| studies on pasteurella pestis in fleas. vii. the plague-vector efficiency of hystrichopsylla linsdalei compared with xenopsylla cheopis under experimental conditions. | 1958 | 13533739 | |
| micro-anatomy of the proventriculus of the common rat flea xenopsylla cheopis (rothschild). | 1960 | 14425284 | |
| a confirmed case of ddt-resistance in xenopsylla cheopis in india. | the authors describe a technique, developed in their laboratory at poona, bombay state, for estimating the susceptibility of the oriental rat-flea, xenopsylla cheopis, to insecticides. using this technique, they compared the susceptibility to ddt, gamma-bhc and dieldrin of a field population of x. cheopis from a locality in poona district which had been sprayed with ddt 28 times, with that of a similar population from a locality in north satara district which had been sprayed only three times. t ... | 1960 | 14430833 |
| epidemiological studies of plague in india: 2. the changing pattern of rodents and fleas in calcutta and other cities. | data from early in the twentieth century up to the present day indicate that rattus rattus among rodents and xenopsylla cheopis among fleas are the two most important elements in urban human plague infection in india, r. norvegicus playing a more minor role. the relative numbers of both these species have decreased in recent years in bombay and calcutta, while those of bandicota bengalensis, which is less heavily parasitized by x. cheopis, have risen. this reduction in the numbers of the epidemi ... | 1960 | 20604076 |
| a preliminary note on ddt-resistance in rat fleas, xenopsylla cheopis and xenopsylla astia, in a sprayed area of delhi. | 1961 | 13911371 | |
| experiments on the olfactory responses and host-specificity of the oriental rat flea (xenopsylla cheopis), (siphonaptera: pulicidae). | 1964 | 14170213 | |
| rat ectoparasite surveys in puerto rico with toxicological studies on xenopsylla cheopis. | 1964 | 14222445 | |
| laboratory evaluation of promising systemic insecticides in guinea pigs against oriental rat fleas. | 1965 | 14269561 | |
| [apropos of field disinsection of ceratophyllus fasciatus and xenopsylla cheopis]. | 1965 | 14345018 | |
| [the flea xenopsylla cheopis has become acclimatized in mine galleries at saint-etienne]. | 1965 | 5899727 | |
| toxicity of various insecticides to xenopsylla cheopis. | 1966 | 5941179 | |
| a simple method for measuring the motor activity of fleas (xenopsylla cheopis roth.). | 1966 | 5963793 | |
| the hygroreaction of the larvae of the oriental rat flea xenopsylla cheopis rothsch. (siphonaptera: pulicidae). | 1967 | 6033643 | |
| systemic insecticides for control of oriental rat fleas: tests in guinea pig. | 1968 | 5642109 | |
| systemic insecticides for control of oriental rat fleas: bait tests with hooded white rats. | 1968 | 5642117 | |
| laboratory methods for evaluation of toxicants for the bed bug and the oriental rat flea. | 1968 | 5723756 | |
| effect of differences in ambient temperature upon the fate of pasteurella pestis in xenopsylla cheopis. | 1969 | 5789111 | |
| influence of host on fecundity of the indian rat flea, xenopsylla cheopis (roths). | 1969 | 5395418 | |
| [resistance to ddt and susceptability of xenopsylla cheopis (roth) to dieldrin. strain of the guayaquil city and of various localities of the loja region]. | 1969 | 5400609 | |
| resistance of the oriental rat flea, xenopsylla cheopis, to ddt in the republic of viet-nam. | 1970 | 5312258 | |
| specific effect of temperature upon transmission of the plague bacillus by the oriental rat flea, xenopsylla cheopis. | 1971 | 5553266 | |
| [cytogenetics of fleas (aphaniptera). ii. xenopsylla cheopis rothschild, 1093, and leptopsylla segnis schönherr, 1811]. | 1971 | 5574761 | |
| systemic insecticides for control of oriental rat fleas: preliminary tests in guinea pigs, 1967-69. | 1971 | 20333843 | |
| effect of temperature on the development of prepupa and pupa of the rat flea, xenopsylla cheopis rothschild. | 1972 | 5036194 | |
| sterile male of the rat-flea xenopsylla cheopis rothschild (siphonaptera). | 1972 | 4653049 | |
| studies on host-flea relationship. 1--histochemistry of egg yolk in xenopsylla cheopis (roths) and xenopsylla astia (roths). | 1972 | 4663245 | |
| effectiveness of dichlorvos vapor against xenopsylla cheopis in containerized cargo. | 1973 | 4710944 | |
| studies on host-flea relationship. ii. sex hormones of the host and fecundity of rat flea xenopsylla astia (rothschild) and xenopsylla cheopis (rothschild) (siphonaptera). | 1973 | 4756871 | |
| on the lipids of the rat flea, xenopsylla cheopis (roth.). | 1973 | 4792760 | |
| response of the cat flea, ctenocephalides felis (bouché), and the oriental rat flea, xenopsylla cheopis (rothschild) to electromagnetic radiation in the 300-700 nanometer range. | 1974 | 4828350 | |
| oriental rat fleas: evaluation of three systemic insecticides in baits for control on cotton rats in outdoor pens. | 1974 | 4833481 | |
| [flea fauna of rodents in coastal region of korea addendum:insecticide susceptibility test of xenopsylla cheopis] | a survey on rats and rat-fleas was performed in costal area of korea during 1972; inchon, kunsan, yosu, busan and other areas. the number of the caught rats was 1,448. total number of collected fleas was 2,480. geographical distribution were described. flea index was in 1.71 total. mothly flea indices were 0.35-0.84 in january to march, 2.13-2.59 in april to june, 0.58 in july and 1.82-4.91 in august to november. mortality rate of x. cheopsis to various concentration of ddt in 1 hour exposure we ... | 1974 | 12913483 |
| the jumping mechanism of xenopsylla cheopis. i. exoskeletal structures and musculature. | the jumping apparatus of the flea, which includes highly modified direct and indirect flight muscles, is described: attention is drawn to the various specializations of the exoskeleton which stiffen the thorax and also provide the 'click' mechanism triggering take-off. a finger-like invagination of tall cells within the cavity of the developing pleural arch of the pharate adult secretes the resilin pad. this is illustrated with coloured photographs. it is suggested that winglessness of a mecopte ... | 1975 | 1804 |
| the jumping mechanism of xenopsylla cheopis. ii. the fine structure of the jumping muscle. | the ultrastructure of the trochanteral depressor muscle of the oriental rat flea is described. it is shown to be similar to that of the tubular leg muscles of other insects except in the volume and arrangement of the sarcoplasmic reticulum. the sarcoplasmic reticulum occupies approximately 18% of the volume of the muscle fibres. it is in three configurations:a regular array of parallel tubules opposite the a-band, a collar of sacculi involved in the formation of the dyads at the edge of the a-ba ... | 1975 | 1805 |
| the jumping mechanism of xenopsylla cheopis. iii. execution of the jump and activity. | the flea's hind legs are the chief source of jumping power, but in species which execute large jumps, take-off is accelerated by elastic energy released from a resilin pad (homologous with the wing hinge ligaments of flying insects) situated in the pleural arch. a central click mechanism, operated by a rapid twitch of the trochanteral depressor (the starter muscle), synchronizes the separate sources of energy which power the jump. ciné photos confirm the morphological evidence that the flea take ... | 1975 | 1806 |
| murine typhus rickettsiae in the oriental rat flea. | 1975 | 1072599 | |
| reproduction, structure and host specificity of trypanosoma (herpetosoms) tamiasi sp. n. from the eastern chipmunk, tamias striatus. | trypanosoma (herpetosoma) tamiasi sp. n. is described from blood and organs of the eastern chipmunk, tamias striatus, and the least chipmunk, eutamias minimus. in experimentally infected tamias striatus and e. minimus, trypanosoma tamiasi reproduced by equal binary fission in the trypo-, sphaero-, epi-, or amastigote form, mainly in lymphoid organs. trypomastigotes developed from amastigotes through epimastigotes, or from sphaeromastigotes, mainly in the same organs. the mean lengths of body ... | 1975 | 1117439 |
| insecticide susceptibility of some vector fleas and mosquitoes in burma. | rat fleas and mosquitoes are insect vectors of public health importance in burma. plague is endemic in central burma and ddt has been the principal insecticide used for its control to date. dengue haemorrhagic fever, recently introduced and transmitted by aedes aegypti, has been spreading to major towns since 1971. the rodents, rattus rattus, r. exulans, bandicota bengalensis, mus musculus, as well as shrews were commonly caught during routine trapping in the country. rattus norvegicus, prevalen ... | 1975 | 131975 |
| ultrastructural comparison of the midgut epithelia of fleas with different feeding behavior patterns (xenopsylla cheopis, echidnophaga gallinacea, tunga penetrans, siphonaptera, pulicidae). | this morphological study describes the ultrastructure of the midgut of three flea species, including temporary parasitic fleas (both sexes of xenopsylla cheopis, males and immature females of echidnophaga gallinacea and tunga penetrans) and stationary parasitic fleas (mature females of e. gallinacea and t. penetrans). (1) three cell types (a,b,c) constitute the midgut epithelium, each appearing in a characteristic and constant frequency along the whole midgut, a) the functional digestive cells f ... | 1976 | 8972 |
| studies on host-flea relationship. iv. progesterone and cortisone do not influence the reproductive potentials of rat fleas xenopsylla cheopis (rothschild) and x. astia (rothschild). | experiments carried out to study the influence of progesterone and cortisone on the initiation of ovarian maturation, fecundity rate and fertility of the two species of rat fleas xenopsylla cheopis (rothschild) and x. astia (rothschild) indicated that these hormones do not exert any influence on their reproductive potentials. this along with earlier observations show that the factors which regulate ovarian maturation and fecundity in these rat fleas are different from those of the rabbit flea sp ... | 1976 | 961004 |
| studies on the host-flea relationship. iii nutritional efficacy of blood meal of rat fleas xenopsylla cheopis (rothschild) and xenopsylla astia (rothschild). | rat fleas, xenopsylla cheopis (rothschild) and x. astia (rothschild) were fed artificially on whole blood, milk and blood fractions in an attempt to identify the factor(s) which trigger ovarian maturation. blood from the white rat, house rat, white mouse, frog, chick and man fed artificially induced vitellogenesis in over 50% of fleas of all combinations except in x. cheopis fed on chick blood. gut distension alone had no influence on initiation of vitellogenesis as judged by feeding milk. washe ... | 1976 | 999361 |
| [characteristics of digestion of blood of different animals by the flea xenopsylla cheopis]. | under experimental conditions fleas x. cheopis engorged and assimilated blood of 4 species of rodents, man, pigeon and two species of reptiles. histological investigations have shown that the structure of food clot, destruction rate of blood cells and general duration of digestion are changed considerably depending on the host's blood. in females the digestion of white mice blood to haematin at 23-24 degrees lasted not over 12 hours, the digestion of blood of hamsters and man - 12 to 20 hours, ... | 1976 | 1023147 |
| [effect of the bacterial preparation, insectin, on the fleas xenopsylla cheopis]. | the effect of 0.2-2 mg/g of insectine (bacillus insectus) upon the ist-iind stage larvae of x. cheopis is very negligible but it manifests itself in the subsequent low (9 to 30%) development and hatching of imagos. the iii stage larvae are more resistent and after the effect of 10 mg/g of the preparation 9% of larvae formed cocoons which later developed into imagos. adult fleas poorly responded to 0.2-2 mg/g of insectine. however, 10-30 mg/g of insectine caused in four days a mass death of fleas ... | 1976 | 1023149 |
| murine typhus and spotted fever in israel in the seventies. | one hundred and eleven cases of rickettsial disease-100 cases of murine typhus and 11 cases spotted fever--seen over a four year period at the chaim sheba medical center are reviewed. the clinical picture of murine typhus (caused by rickettsia mooseri and transmitted by xenopsylla cheopis) could not be distinguished from that of spotted fever (caused by a rickettsia similar to rickettsia conori and transmitted by rhipicephalus). some quite severe cases of murine typhus and some relatively mild c ... | 1977 | 881266 |
| [the preservation of the causative agent of intestinal yersiniosis in xenopsylla cheopis fleas]. | experimentally infected fleas of x. cheopis are capable of preserving two strains of y. enterocolitica. one of the strains was found to belong to the 3rd, the other to the 9th serotype. the both strains actively multiplied and accumulated in great amount (up to several millions of microbial cells) in ectoparasites which were maintained at 6 to 8 degrees c. at a temperature of 18 to 21 degrees c some part of fleas gradually became free from the agent that was favoured by their periodical feeding ... | 1979 | 95814 |
| [the proventriculus of the xenopsylla cheopis flea studied by scanning electron microscopy]. | the proventriculus of the flea x. cheopis was studied by means of scanning electron microscopy. the external surface of the proventriculus is a rigid structure with an alveolate surface ("wasp nest") formed by muscular cords. the internal surface of the proventriculus is represented by numerous acanthae which fall close together. they have a shape of bent dens with longitudinal sharply angular edges and concave spaces between them. some edges are crenate. | 1979 | 95815 |
| [changes in the numbers of the causative agent of intestinal yersiniasis (yersinia enterocolitica) in xenopsylla cheopis (aphaniptera) fleas in the process of blood digestion]. | in infected fleas the agent of intestinal yersiniosis underwents a complex cycle of quantitative changes after each feeding. a species belonging of blood consumed greatly affected the dynamics of the agent abundance. the general peculiarity of the development of microbes in insects, which fed on various animals (white mice, sirian hamsters, white rats and guinea pigs), is characterized by the decrease in the abundance of the agent during the first hours after feeding. this was followed by an act ... | 1979 | 492770 |
| [change in the frequency of blocking in xenopsylla cheopis (aphaniptera) fleas infected with the causative agent of plague under the action of indandione blood anticoagulants]. | 1979 | 583178 | |
| [characteristics of microbial multiplication in parenterally infected xenopsylla cheopis (siphonaptera) fleas]. | being inoculated parenterally various microbes cause the fleas x. cheopis a stable infection which, as a rule, is preserved in experimental insects to the end of life. reproducing intensively listeria monocytogenes and salmonella typhimurium caused the death of all ectoparasites in 3 to 5 days. the increase in abundance of escherichia coli, yersinia pseudotuberculosis, y. enterocolitica and vaccine strains of y. pestis "ev" and francisella tularensis went on gradually and infected fleas lived up ... | 1980 | 6780964 |
| plague in central java, indonesia. | plague in man occurred from 1968 to 1970 in mountain villages of the boyolali regency in central java. infected fleas, infected rats, and seropositive rats were collected in villages with human plague cases. subsequent isolations of yersinia pestis and seropositive rodents, detected during investigations of rodent plague undertaken by the government of indonesia and the who, attested to the persistence of plague in the region from 1972 to 1974.since 1968, the incidence of both rodent and human p ... | 1980 | 6968252 |
| [histological study of xenopsylla cheopis fleas infected with the ulegeic subspecies of the plague microbe, yersinia pestis ulegeica]. | the plague microbe of the ulegei subspecies is able to cause the stable infection of fleas of x. cheopis, which is accompanied by the formation of "block" in most individuals. the preservation of the plague agent in these ectoparasites is characterized by its variation in the number that undergoes cyclic changes depending on the feeding rate and digestion. the bloodsucking is accompanied by the excretion of some microbes and by the reproduction of the remaining ones in the midgut and proventricu ... | 1980 | 7402697 |
| susceptibility to ddt, malathion, fenitrothion and dieldrin of three flea species in the boyolali plague endemic area, central java, indonesia. | insecticide susceptibility tests with 4% ddt, 0.5% and 5.0% malathion, 1% fenitrothion, and 0.2% dieldrin impregnated papers were carried out with fleas spp. from the boyolali plague zone. the field flea (stivalius cognatus) which was highly susceptible to malathion before, has now been found to be resistant to the insecticide, but was found susceptible to the other three insecticides. the oriental rat flea (x. cheopis) which found previously highly resistant to ddt, was now found to be less res ... | 1980 | 7403939 |
| a study of small mammals in the ciloto field station area, west java, indonesia, with special reference to vectors of plague and scrub typhus. | from june 1977 to june 1978 a study of smal mammals was carried out in the ciloto field station area, west java, indonesia by the who vector biology and control research unit-ii. the objectives of the investigations were to determine the diversity and density of rodent species, to find potential plague and scrub typhus vectors and to study their host-parasite relationships. in the 13 month period a total of 6 species of murids were identified; two species of campestral rats (r. tiomanicus and r. ... | 1980 | 7403957 |
| rodent and scrub typhus survey in a ricefield at kramat tunngak area, tanjung priok, jakarta, indonesia. | trapping of small mammals in a ricefield at kramat tunggak around tanjung priok in jakarta city, was carried out from july 1977 through june 1978. of three species of rodents, r.argentiventer was found to be the predominant species in the ricefield. r.r.diardii was an intermittent resident, and the presence of r.norvegicus was interesting observation. s.murinus, a house shrew, was also present. r.argentiventer was the dominant species during the periods when the rice grains were available as a s ... | 1980 | 7434074 |
| experimental infection of ectoparasitic arthropods with rickettsia prowazekii (gvf-16 strain) and transmission to flying squirrels. | epizootiologic studies conducted during the past few years showed the existence of widespread natural infection of the southern flying squirrel, glaucomys volans, with epidemic typhus rickettsiae, rickettsia prowazekii. the ecological findings strongly implicated transmission of the etiologic agent by an arthropod vector. studies were conducted under controlled laboratory conditions to determine whether ectoparasites naturally associated with flying squirrels (squirrel fleas, lice, mites and tic ... | 1981 | 6782900 |
| [effect of dendrobacillin on the flea xenopsylla cheopis (siphonaptera)]. | 1982 | 6806764 | |
| [histological studies of the gamogony and sporogony of hepatozoon erhardovae in experimentally infected rat fleas (xenopsylla cheopis)]. | we studied, under experimental conditions, the life cycle of hepatozoon erhardovae in the tropical rat flea, xenopsylla cheopis, light microscopically on coloured semi-thin sections. fleas killed and prepared on the day of infection show stomachs filled with mice erythrocytes. some monocytes are parasitized or show empty envelopes of gametocytes. the latter perforate the wall of the stomach, leaving behind empty parasitophorous vacuoles, and they migrate to the fat-body cells of the flea where t ... | 1982 | 7136189 |
| the influence of host age on the survival and frequency of feeding of adults xenopsylla cheopis. | 1983 | 6663110 | |
| a study of commensal rodents and shrews with reference to the parasites of medical importance in chanthaburi province, thailand. | a total of 622 and 110 commensal and forest rodents and shrews was examined in the urban and rural areas of chanthaburi province, thailand. a higher density of commensal animals was found in urban than rural areas. five enteropathogenic bacteria, and four helminth species of significant medical importance were collected. the oriental rat-flea, x. cheopis was found prevalent among these animals. the findings of adult a. cantonensis worm in s. murinus the first reported case of the parasite develo ... | 1983 | 6685345 |
| [repellent properties of mannich bases and cresol and phenol derivatives for aedes aegypti l. mosquitoes and the flea xenopsylla cheopis roths]. | 1983 | 6843496 | |
| [electron microscopic study of the malpighian tubules in fleas (siphonaptera)]. | a study was carried out of ultrastructure of malpighian tubules of 4 species of fleas as follows: xenopsylla cheopis, ceratophyllus fasciatus, leptopsylla segnis, ctenophthalmus orientalis. all cells of malpighian tubules are of polar structure: their apical department is represented with microvilli while basal one--with a system of membrane invaginations forming the basal labyrinth. the most developed system of basal invaginations is observed in distal cells of the malpighian tubules. microvill ... | 1983 | 6856327 |
| rickettsia mooseri infection in the fleas leptopsylla segnis and xenopsylla cheopis. | detailed observations on the acquisition and propagation of experimental rickettsia mooseri infection in two species of fleas are presented. rickettsia mooseri infection became detectable by means of the direct fluorescent antibody test about 2 days earlier in leptopsylla segnis than in the putative vector, xenopsylla cheopis. by the 6th day after the infective feeding, the entire lining and the lumen of the midgut in l. segnis contained masses of rickettsiae and the agent was being passed in th ... | 1983 | 6418017 |
| evaluation of commercial and experimental repellents against xenopsylla cheopis (siphonaptera: pulicidae). | 1984 | 6502623 | |
| [ectoparasites of rodents of the urban region of belo horizonte, mg. i. interaction between ectoparasites and hosts]. | a rodent ectoparasite survey was made in the city of belo horizonte, minas gerais, brazil, from june 1980 to september 1982. the species of ectoparasites captured from 950 rattus norvegicus norvegicus were: xenopsylla cheopis, ctenocephalides felis felis, polyplax spinulosa, laelaps nuttalli, echinolaelaps echidninus and atricholaelaps glasgowi, the last species only represented by three specimens interchanged with wild rodent. p. spinulosa and l. nuttalli, although cosmopolitan, are recorded fo ... | 1984 | 6535917 |
| the effect of various atmospheric conditions on the development of two strains of xenopsylla cheopis in egypt. | 1984 | 6542579 | |
| some biological studies on two different geographical strains of xenopsylla cheopis. | 1984 | 6736713 | |
| evidence for the extinction of plague in hawaii. | plague (infection by yersinia pestis) was present in hawaii for the period 1899-1957 and caused at least 370 fatalities. the first infections came from immigrant commensal rats, probably rattus rattus and rattus norvegicus, on ships from the orient. both species were already established in hawaii and became the widespread local carriers of plague, supplemented by rattus exulans which had colonized the islands in ancient polynesian times. the flea xenopsylla vexabilis arrived with r. exulans, and ... | 1984 | 6364800 |
| [ectoparasites of rodents of the urban region of belo horizonte, mg. ii. variations of the infestation indices in rattus norvegicus norvegicus]. | the indices of infestation by the mites echinolaelaps echidninus and laelaps nuttalli, the louse popyplax spinulosa and the flea xenopsylla cheopis, obtained monthly, from june 1980 to september 1982, on rattus norvegicus norvegicus in the city of belo horizonte, minas gerais state, brazil were related to seasonal period, sex of the host and area of capture. mites and insects showed different behaviour in relation to these factors. only the fleas and lice exhibit significant association between ... | 1985 | 3836329 |
| [ectoparasites in rodents of the urban region of belo horizonte, mg. iii. fleas, anoplura and acari indices in rattus norvegicus norvegicus]. | the total and specific indices of fleas, lice and mites were determined for ectoparasites on rattus norvegicus norvegicus capture in urban areas of belo horizonte, minas state, brazil, from june 1980 to september 1982. in view of the limiting or critical values attributed to flea indices above all the "cheopis" index, proposed by several authors as a complementary measure for bubonic plague surveillance, the community of belo horizonte would have been exposed to this infection. the annual total ... | 1985 | 3837169 |
| transmission of murine typhus rickettsiae by xenopsylla cheopis, with notes on experimental infection and effects of temperature. | in studies on experimental infection of rickettsia mooseri (= r. typhi) in xenopsylla cheopis and laboratory rats, it was found that 10 days after the infectious feeding, the fleas were voiding feces that were infective to rats upon inoculation. the feces remained infective for at least the duration of the experiment, and a quantity as small as 0.2 micrograms of feces would result in seroconversion of 67% of the rats upon inoculation. fleas were capable of transmitting the infection to rats as e ... | 1985 | 3923852 |
| transovarial transmission of murine typhus rickettsiae in xenopsylla cheopis fleas. | it has been generally accepted that infected fleas do not pass on rickettsia mooseri, or indeed any other known pathogen, to their progeny. it is reported here that such transovarial transmission does occur in laboratory-infected xenopsylla cheopis fleas. by means of the direct fluorescent antibody test, rickettsia mooseri was observed in cells of the hemolymph of infected fleas. as many as 11 percent of the adults and 2.9 percent of the larvae of the generation reared therefrom, had demonstrabl ... | 1985 | 3966162 |
| xenopsylla cheopis: cellular expression of hypersensitivity in guinea pigs. | guinea pigs multiply exposed to xenopsylla cheopis adult fleas exhibited marked blood basophil responses to challenge infestation with only minor changes in blood eosinophil levels. dermal responses to flea feeding were marked by dominant neutrophil (52% of the infiltrate) and eosinophil (32%) accumulations 24 hr after primary feeding, with a weak basophil response (11%). however, after challenge feeding 14 days later, eosinophils dominated, representing 59% of the infiltrate with basophils comp ... | 1985 | 3967727 |
| fleas on roof rats in six areas of los angeles county, california: their potential role in the transmission of plague and murine typhus to humans. | roof rats (rattus rattus) in southern california are rarely involved with plague epizootics and murine typhus. little evidence exists implicating these rodents as sources of human infection. this might be explained by the absence of fleas capable of transmitting these 2 diseases. from february 1981 through january 1982, roof rats were live-trapped and examined for fleas each month in 4 areas of los angeles county. two other areas were trapped for 9 and 3 months respectively. areas sampled were i ... | 1985 | 3985278 |
| [block formation capacity in fleas infected with a plague agent after their feeding with blood substitutes]. | by feeding plague infected xenopsylla cheopis fleas with blood substitutes free of blood formed elements blocked fleas were obtained. these fleas are able to transmit plague agent to white mice and cause their mortality. | 1985 | 4011313 |
| [characteristics of the multiplication of a virulent strain of the plague microbe in xenopsylla cheopis fleas infected parenterally]. | xenopsylla cheopis fleas infected parenterally with the virulent strain of plague microbe of gerbil variant preserved the agent to the end of their lives. in the body cavity the microbes retained their ability for reproduction which was, however, limited. during the first seven days after the infection the number of microbes slightly increased and later became stabilized. its mean indices (mean g) varied within the limits of 500 to 2000 microbe cells per 1 individual, maximum index rarely exceed ... | 1985 | 4047718 |
| [finding of the flea xenopsylla cheopis roths. in nests of the common vole (microtus arvalis pall.) in leningrad]. | 1985 | 3156305 |