| a survey of thelazia worms in the eyelids of british cattle. | thelazia skrjabini and t gulosa were found in the eyes of 237 of 566 bovine heads (41.9 per cent) examined in a surrey abattoir during 1976. the prevalence of infection increased during late june, july and august, when a new generation of worms emerged in eyes. the burden in eyes ranged from one to 170 worms, with a mean count of 10.44 +/- 3.23. worms were found behind and in third eyelids and in the lacrimal ducts of lower eyelids, which makes their detection very difficult by clinical examinat ... | 1978 | 565553 |
| two eyeworms, thelazia gulosa and thelazia skrjabini, in cattle in kentucky. | | 1975 | 1238518 |
| the efficacy of ivermectin against the eyeworm, thelazia skrjabini, in experimentally infected cattle. | the anthelmintic efficacy of ivermectin (administered subcutaneously at 200 micrograms kg-1 body weight) was assessed for control of thelazia skrjabini in experimentally infected calves. twenty-four uninfected male holstein calves, 1-2 weeks old, were artificially infected with thelazia skrjabini by placing 15 third-stage larvae under the third eyelid of calves. the challenge larvae were recovered from naturally infected face flies, musca autumnalis. the exposed calves were randomly assigned to ... | 1992 | 1485413 |
| development of the nematode eyeworm, thelazia skrjabini (nematoda: thelazioidea), in experimentally infected face flies, musca autumnalis (diptera: muscidae). | the development of thelazia skrjabini erschow, 1928, was studied in experimentally infected laboratory-reared musca autumnalis de geer. thelazia skrjabini developed to the infective third stage in a minimum of 9 days in m. autumnalis maintained at 27 +/- 2 c. first-stage larvae were not observed postinoculation, but second-stage larvae were first observed 3 days postinoculation. development was asynchronous. second- and third-stage larvae occur in capsules, occasionally in the head but primarily ... | 1991 | 2040954 |
| a study on the prevalence and intensity of occurrence of thelazia skrjabini (nematoda: thelazioidea) in cattle in central alberta, canada. | the distribution of thelazia skrjabini in the eyes of cattle was examined from necropsies on 297 animals. although the overall prevalence in beef cattle (21.5%) was similar to that in dairy cattle (25.7%), in general worms were more abundant in beef than in dairy animals. the worm prevalence was lowest in the months from march to june and highest in september among beef and dairy animals. thelazia skrjabini was found in 76 (16.8%) eyes from beef, and 23 (16.4%) eyes from dairy cattle. infections ... | 1990 | 2319419 |
| prevalence and intensity of thelazia spp. (nematoda: thelazioidea) in a musca autumnalis (diptera: muscidae) population from central alberta. | a face fly (musca autumnalis) population near wetaskiwin, central alberta, canada, was sampled 9 times from 26 july to 29 september 1988 for the early larval stages of thelazia spp. of 426 female flies examined, 159 (37%) contained thelazia spp. (almost exclusively t. skrjabini), with an average worm burden of 4.2 larvae per infected fly. prevalence ranged from 17 to 56% over 9 collections. this is the first report of thelazia skrjabini in flies from western north america and the highest thelazi ... | 1989 | 2795384 |
| prevalence of some internal parasites recovered at necropsy of thoroughbreds born in 1982 in kentucky. | a total of 89 thoroughbreds, 14 to 333 days old (born in 1982), were examined at necropsy for certain internal parasites during a 1-year-period, mar 1, 1982, to feb 28, 1983. the eyes of 73 of the horses and the cranial mesenteric arteries of 71 were examined. specific interest was on prevalence of parasites according to month of the year and age of the horses at necropsy. parasites recovered (first month-last month infected horse found) were as follows: thelazia lacrymalis (eyes) immature and m ... | 1985 | 3994134 |
| bovine thelaziasis in iowa. | the prevalence of developing thelazia nematodes in face flies (musca autumnalis) was studied for 7 yr at a beef farm in central iowa. juvenile nematodes were not found among flies in reproductive diapause in autumn, nor among nulliparous, overwintered flies in spring, but only among actively reproducing insects. thus thelazia probably do not overwinter in face flies. a mean prevalence of 2.0% infected was recorded among flies in 7 fly breeding seasons. no heterogeneity in thelazia prevalence was ... | 1985 | 4040164 |
| [thelazia skrjabini in danish cattle (author's transl)]. | | 1974 | 4421733 |
| thelazia skrjabini erschow, 1928 from an indian buffalo (bubalus bubalis). | | 1970 | 5466422 |
| [studies on thelaziasis of cattle. i. thelazia skrjabini erschow, 1928 found in japan]. | | 1966 | 5949204 |
| eye worms in cattle in indiana. | of 320 indiana cattle examined for eye worms between aug 31, 1977 and july 12, 1979, 88 (28%) were found to be infected with thelazia gulosa and thelazia skrjabini. seventeen cattle had eye worms in both eyes and 65 cattle had therm in a single eye (worms from 6 cattle were pooled, thus not included). from 1 to 28 eye worms (mean, 6) were found per infected animal. breed predilection was not evident, and 3-year-old cattle had the highest proportion of infection. | 1981 | 7195389 |
| the efficacy of ivermectin (pour-on) against the eyeworms, thelazia gulosa and thelazia skrjabini in naturally infected cattle. | sixteen crossbred beef cattle, 6-8 months of age, were used to determine the efficacy of ivermectin in a pour-on formulation against natural infections of thelazia spp. cattle were weighed on day 0, ranked in descending order by bodyweight and sequentially paired. within each pair, one animal was randomly assigned to an untreated control group, while the other animal was treated with a pour-on formulation of ivermectin applied topically at 1.0 ml per 10 kg bodyweight to achieve a dosage of 500 m ... | 1994 | 7879384 |
| site segregation of thelazia skrjabini and thelazia gulosa (nematoda: thelazioidea) in the eyes of cattle. | one thousand three hundred and twenty-two eyes obtained from slaughtered cattle throughout alberta were examined for eyeworms. each eye was partitioned into 9 sites and all eyeworms were recorded by site. seven hundred eyeworms were recovered from 121 infected eyes. the distribution of thelazia skrjabini across the 9 sites differed significantly (p < 0.001) from that of thelazia gulosa. the 2 major lacrimal ducts associated with the harderian gland contained 58% (354/613) of the t. skrjabini pre ... | 1994 | 8064515 |
| efficacy of doramectin against eyeworms (thelazia spp.) in naturally and experimentally infected cattle. | the anthelmintic efficacy of doramectin was assessed for the control of thelazia spp. in two studies using 44 naturally or experimentally infected calves. cattle were randomly assigned based on weight to either a doramectin treatment group or a saline control group. treated animals received doramectin at a dosage of 200 micrograms kg-1, subcutaneously in the lateral midline of the neck. control animals received an equivalent dosage of 0.9% sterile saline. animals were slaughtered 13-16 days afte ... | 1993 | 8236740 |
| prevalence of eyeworms (nematoda: thelazioidea) in beef cattle grazing different range pasture zones in alberta, canada. | the eyes from 410 beef cattle grazing 6 range pasture zones in alberta were dissected and examined for species of thelazia. thirty-eight (9.3%) contained eyeworms: 25 (6.1%) contained thelazia skrjabini alone, 3 (0.7%) contained thelazia gulosa alone, and 10 (2.4%) had a mixed infection of t. skrjabini and t. gulosa. prevalence was related to the type of pasture. the prevalence was lower in cattle grazing short- and mid-grass pastures (zones 1, 2; 0% and 1.5%, respectively) than those grazing tr ... | 1993 | 8277378 |
| first report of immature thelazia skrjabini (nematoda: thelazioidea) from the eye of a white-tailed deer, odocoileus virginianus. | the eyes from 103 hunter-killed white-tailed deer (odocoileus virginianus), and 19 mule deer (o. hemionus) killed between 28 november to 14 december 1991 from wainwright, alberta were examined for thelazia spp. one immature male and two immature female thelazia skrjabini were collected from beneath the third eyelid of one adult female o. virginianus. this is the first report of t. skrjabini in a member of the cervidae. | 1993 | 8445781 |
| differentiation among three species of bovine thelazia (nematoda: thelaziidae) by polymerase chain reaction-restriction fragment length polymorphism of the first internal transcribed spacer its-1 (rdna). | thelazia gulosa, thelazia rhodesi and thelazia skrjabini are nematodes transmitted by some species of musca (diptera: muscidae) which cause ocular infestations in bovines. differences in the rdna of these species were determined by a pcr using different sets of relatively conserved oligonucleotide primers. pcr on the first internal transcribed spacer (its-1) revealed differences in size in thelazia species (437 bp for t. gulosa, 370 bp for t. rhodesi and 506 bp for t. skrjabini) while the dna co ... | 2001 | 11730798 |
| molecular epidemiological survey on the vectors of thelazia gulosa, thelazia rhodesi and thelazia skrjabini (spirurida: thelaziidae). | a polymerase chain reaction (pcr)- based assay developed for the specific identification of thelazia gulosa, thelazia rhodesi and thelazia skrjabini (nematoda, spirurida), which cause bovine ocular thelaziosis, was evaluated for its usefulness in detecting the intermediate hosts and in estimating the infection prevalence of vectors in field conditions throughout 5 years (from 1997 to 2001). a total of 5190 flies were captured and identified as musca larvipara, musca osiris, musca autumnalis, mus ... | 2003 | 14636023 |
| [tabulation of the cycle of development of nematoda thelazia skrjabini erschow, 1928, ocular parasite in cattle]. | | 1952 | 14906249 |
| [ecology of thelazia spp. in cattle and their vectors in italy]. | the genus thelazia (spirurida, thelaziidae) includes a cosmopolitan group of eyeworm spirurids responsible for ocular infections in domestic and wild animals and transmitted by different species of muscids. bovine thelaziosis is caused by thelazia rhodesi desmarest 1828, thelazia gulosa railliet & henry 1910, and thelazia skrjabini erschow 1928, which occur in many countries; t. gulosa and t. skrjabini have been reported mainly in the new world, while t. rhodesi is particularly common in the old ... | 2004 | 15305729 |
| fine structure of body surface of thelazia skrjabini (nematoda: spirurida, thelaziidae). | thelazia skrjabini (spirurida, thelaziidae) is a parasite of cattle that causes ocular infections. scanning electron microscopy was used to study the surface ultrastructure of adult worms of this nematode. at the anterior end of both sexes, the buccal opening was orbicular. around the mouth, two circles of cephalic papillae were seen: the inner circle with six papillae and the outer circle with four submedian papillae. at both lateral sides of the head, two amphids were observed. a pair of later ... | 2007 | 16912907 |
| the eyeworm, thelazia skrjabini, in cattle in canada. | | 1987 | 17422771 |