Publications

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lutzomyia youngi (diptera: psychodidae), a new phlebotomine sand fly previously misidentified as l. townsendi in endemic foci of cutaneous leishmaniasis in venezuela and costa rica. 19873585911
[excretion of promastigotes of leishmania pifanoi by experimentally infected lutzomyia youngi].the increase in the promastigotes population of leishmania pifanoi in lutzomyia youngi experimentally infected and kept on 50% sacarose under constant conditions of temperature and humidity is described. two stages in the differentiation and growth of the parasites are recognised between two and twenty-four hours after meals. the pleomorphic differentiation of the amastigotes in short promastigotes which multiply by binary division for 60 hours, when the rupture of the peritrophic membrane occur ...19958734975
phlebotomine sandflies associated with a focus of cutaneous leishmaniasis in valle del cauca, colombia.a survey was made of the phlebotomine sandfly fauna of la guaira, a village with coffee plantations near cali, colombia, from which cases of american cutaneous leishmaniasis had been reported due to leishmania (viannia) panamensis and le. (v.) braziliensis. among six species of sandfly collected on human bait, lutzomyia youngi was most important in terms of biting nuisance. lu.columbiana, lu.lichyi and lu.scorzai as well as lu.youngi adults occurred throughout the year. sandfly man-biting activi ...19957548944
[xenodiagnosis using lutzomyia youngi in venezuelan cases of cutaneous leishmaniasis due to leishmania braziliensis].eight patients infected with leishmania braziliensis were used for xenodiagnosis with lutzomyia youngi, before and after specific antileishmanial treatment with "glucantime" and "gabbromycin". all of them infected sandflies fed on the borders of the skin lesions before the treatment, suggesting that infected persons might act as reservoirs of infection for an indoor-biting sandfly species. the negative results obtained by xenodiagnosis carried out after specific treatment of the same individuals ...19892319949
[metacyclics of leishmania mexicana in the hypopharynx of lutzomyia youngi experimentally infected].although it has been postulated that the natural transmission of leishmaniasis occurs by regurgitation of the parasites from contaminated proboscis of phlebotomine vector recent experimental results seems to oppose this thesis. wild-caught and laboratory-reared females of lutzomyia youngi, vector of leishmania mexicana in the venezuelan andes, were infected on tarsal lesion of hamsters, inoculated 6 weeks previously s.c. with 2 x 10(4) amastigotes of l. mexicana s.l., isolated from venezuelan ca ...19911841249
insecticide resistance in phlebotomine sandflies in southeast asia with emphasis on the indian subcontinent.visceral leishmaniasis, commonly known as kala-azar in india, is a global public health problem. in southeast asia, bangladesh, bhutan, india, nepal, sri lanka and thailand are endemic for visceral leishmaniasis. the role of sandflies as the vector of kala-azar was first confirmed in 1942 in india. insecticide resistance in phlebotomus argentipes annandale and brunetti, the vector of kala-azar in the indian subcontinent, was first reported in 1987 in bihar, india. this article provides a scoping ...201627817749
insecticide impregnated curtains to control domestic transmission of cutaneous leishmaniasis in venezuela: cluster randomised trial.to measure the impact on transmission of leishmaniasis of curtains impregnated with insecticide.012376442
dna barcoding for the identification of sand fly species (diptera, psychodidae, phlebotominae) in colombia.sand flies include a group of insects that are of medical importance and that vary in geographic distribution, ecology, and pathogen transmission. approximately 163 species of sand flies have been reported in colombia. surveillance of the presence of sand fly species and the actualization of species distribution are important for predicting risks for and monitoring the expansion of diseases which sand flies can transmit. currently, the identification of phlebotomine sand flies is based on morpho ...201424454877
leishmania (viannia) infection in the domestic dog in chaparral, colombia.abstract. peridomestic transmission of american cutaneous leishmaniasis is increasingly reported and dogs may be a reservoir of leishmania (viannia) in this setting. we investigated the prevalence of infection in dogs in chaparral county, colombia, the focus of an epidemic of human cutaneous leishmaniasis caused by leishmania (viannia) guyanensis. two (0.72%) of 279 dogs had lesions typical of cutaneous leishmaniasis that were biopsy positive by kinetoplast dna polymerase chain reaction-southern ...201121540374
canine leishmaniosis in south america.abstract : canine leishmaniosis is widespread in south america, where a number of leishmania species have been isolated or molecularly characterised from dogs. most cases of canine leishmaniosis are caused by leishmania infantum (syn. leishmania chagasi) and leishmania braziliensis. the only well-established vector of leishmania parasites to dogs in south america is lutzomyia longipalpis, the main vector of l. infantum, but many other phlebotomine sandfly species might be involved. for quite som ...200919426440
transmission potential, skin inflammatory response, and parasitism of symptomatic and asymptomatic dogs with visceral leishmaniasis.visceral leishmaniasis in brazil is caused by the protozoan leishmania (leishmania) chagasi and it is transmitted by sandfly of the genus lutzomyia. dogs are an important domestic reservoir, and control of the transmission of visceral leishmaniasis (vl) to humans includes the elimination of infected dogs. however, though dogs are considered to be an important element in the transmission cycle of leishmania, the identification of infected dogs representing an immediate risk for transmission has n ...200818990238
leishmania (viannia) braziliensis infection in two colombian dogs: a note on infectivity for sand flies and response to treatment.although canine cutaneous leishmaniasis has been reported in several foci of south america, no published information from colombia is available.200617361862
[dog (canis familiaris) infectivity to lutzomyia youngi in trujillo, venezuela].in trujillo, venezuela the prevalence for american tegumentary leishmaniasis (atl) is 38 per 100,000 inhabitants.200617361861
[phlebotomine sandflies in the southeast of lara state, venezuela].the report of 522 cases of american cutaneous leishmaniasis between the years 1988 to 2002 in lara state (specifically in the southeast where there was an increase of cases) prompted the study of the vectors species involved in transmission.200617361844
diversity and species composition of sand flies (diptera: psychodidae) in a venezuelan urban focus of cutaneous leishmaniasis.the present study examined the spatial and temporal abundance and diversity of phlebotomine sand flies in an area of venezuela that is an ancient focus of leishmaniasis. the study was conducted in 6 stations in urban localities in trujillo city, located in northwestern venezuela (9 degrees 22' 24" n, 70 degrees 26' 08" w), which is located in a mountain range in the andean ecoregion (altitude = 600-1,010 m). during 1995-99, entomological surveys were conducted after and before the rainy season. ...200415270002
[new findings on the geographic distribution of the verrucarum group (diptera: psychodidae) in colombia].the incrimination of sand flies belonging to verrucarum species group in the leishmaniasis transmission underscores the need for a detailed information on the geographical distribution of these species. the current listing adds 34 new records that extend significantly the knowledge of the geographical distribution of the verrucarum group in colombia. the most important new records pertain to lutzomyia spinicrassa in the tropical dry forest of the atlantic coast, lutzomyia ovallesi in the orinoco ...200314582337
[karyotypic comparison of five species of lutzomyia (diptera: psychodidae) of the series townsendi and the verrucarum group in colombia].cytogenetic characteristics were established for five native species of phlebotomine sand flies (lutzomyia, series townsendi, verrucarum group): lutzomyia longiflocosa, lutzomyia townsendi, lutzomyia spinicrassa, lutzomyia torvida and lutzomyia youngi. karyotypes and chromosomal morphometry were compared. using the squash technique, brain tissues from late 4th instar larvae provided the necessary mitotic chromosomes. chromosomal measurements were made on the following chromosomal characteristics ...200212596447
salivary amylase activity of the phlebotomine sand fly, lutzomyia longipalpis.both male and female adult stages of the sand fly lutzomyia longipalpis have detectable amylase activity in their salivary glands, as indicated by formation of p-nitrophenyl-alpha-d-maltoside from p-nitrophenyl-alpha-d-octoside and by hydrolysis of 4-nitrophenyl-alpha-d-maltoheptaoside-4,6,-o-ethylidene. no salivary alpha-glucosidase was detected. amylase activity was also found in the crop and midgut of female flies, although in a smaller amount. salivary amylase is significantly reduced from t ...200010727893
about the authorship of lutzomyia youngi (diptera: psychodidae) 199910416195
[presence of metacyclical promastigotes of leishmania pifanoi in the hypopharynx of lutzomyia youngi and their sugar consumption].the presence of metacyclical promastigotes of leishmania pifanoi in the hypopharyngeal duct of lutzomyia youngi is reported. the insects were experimentally infected by engorgement on the tarsal lesions of hamsters. the metacyclics, whose morphology is illustrated, appeared in the hypopharynx 5 to 9 days after engorgement; they were more frequently found in the insects fed on unrefined commercial sugar. they role of amino derivates of glucose and galactose, as well as of amino acids in the devel ...19969110469
an attempt to control phlebotomine sand flies (diptera: psychodidae) by residual spraying with deltamethrin in a colombian village.an attempt was made to control phlebotomine sand flies biting indoors in a rural community near cali, colombia, using the residual insecticide "k-othrine" (deltamethrin) sprayed on the inside walls of houses. twelve houses were divided into matched pairs based on physical characteristics, one house in each pair being left untreated while the inside walls of the other were sprayed with 1% deltamethrin at a concentration of 500 mg a.i./m2. sand flies were sampled each week using protected human ba ...19958544745
[leishmania braziliensis: isolation from lesions by inoculation of hamsters with and without addition of salivary gland lysate from lutzomyia youngi].homogenized biopsy tissue from the cutaneous leishmaniasis lesions of 50 patients from trujillo, venezuela, were inoculated subcutaneously into the tarsi of male hamsters. homogenized tissue either alone or mixed with salivary gland lysates of lutzomyia youngi were used for inoculation. homogenized tissue alone yielded 58.5% of infections with a mean of twelve weeks for prepatency, while those mixed with sandfly lysate resulted in 92% of infections with a mean prepatency of three weeks.19958525308
sugars in the alimentary canal of lutzomyia youngi (diptera: phlebotominae).gas chromatography (gc) analysis of 159 specimens (144 females and 15 males) of lutzomyia youngi collected in shannon traps in a coffee plantation in the andean region of western venezuela, where leishmaniasis is endemic, revealed the presence of fructose, sucrose, glucose and maltose in the gut and crop of the wild sandflies. the identification of the sugars was confirmed by comparing retention times with those observed for standard sugars and those obtained from sandflies experimentally fed on ...19948161842
potential sources of sugar for the phlebotomine sandfly lutzomyia youngi (diptera: psychodidae) in a colombian coffee plantation.sugar-deprived lutzomyia youngi were exposed to each of the five most numerous plant species in a colombian coffee plantation for 24 h and then tested for the presence of fructose by the cold anthrone assay. many flies exposed to coffee (coffea arabica) (up to 55% in an individual test) and guamo (inga edulis) (up to 28.0%) gave positive results. although some flies also took sugar from red-flowered balsam (impatiens balsamina) and bamboo (bambusa angustifolia), none of the insects exposed to pl ...19947979645
physiological age in lutzomyia youngi (diptera: psychodidae) populations from an endemic area for cutaneous leishmaniasis, venezuela.batches of sylvatic females of lutzomyia youngi (phlebotominae) captured in a shannon trap on twelve occasions over one year in a locality where subcutaneous leishmaniasis is endemic, near the city of trujillo, venezuela, were used to study: 1) the percentages of parous females according to previously established criteria and 2) the average number of eggs laid spontaneously by isolated females during 7 days after feeding on hamsters. the data on the batches of females captured on nights previous ...19947660044
[identification of lutzomyia spp. (diptera: psychodidae) verrucarum group through electron microscopy of its eggs].the value of colombian phlebotomine eggs for species determination was studied with a scanning electron microscope. the species diversity and medical importance of the verrucarum group were the bases to select lutzomyia youngi, lutzomyia evansi, lutzomyia columbiana and lutzomyia longiflocosa. the egg surface was poligonal. lutzomyia youngi, and lutzomyia columbiana had pentagonal or hexagonal patterns; lutzomyia evansi elongated polygons and lutzomyia longiflocosa irregular polygonal sculpturin ...200611354968
genetic relationships among phlebotomine sand flies (diptera: psychodidae) in the verrucarum species group.isozyme data were used to identify populations of certain lutzomyia taxa in the verrucarum species group, mostly in the series townsendi. lutzomyia youngi feliciangelis and murillo and l. spinicrassa morales, osorno, osorno, and hoyos each have diagnostic allomorphs for phosphogluconate dehydrogenase (6pgdh) and fumarate hydratase (fum). the 6pgdh and fum data and those from 6-phospho-fructokinase and phosphoglucomutase distinguish lutzomyia sp., a new species from columbia to be described and n ...19902299652
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