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Biomedical subjects

E A Widmer

Publications and source records attributed to E A Widmer.

11 recordsLinked to original sources
PubMed1995

Intracapsular asexual proliferation of Mesocestoides sp. tetrathyridia in the gastrointestinal tract and mesenteries of the prairie rattlesnake (Crotalus viridis viridis).

Nonproliferous and proliferous tetrathyridia (Mesocestoides sp.) have been reported from natural and experimental infections in reptiles and rodents. Multiple tetrathyridia (1+) in individual capsules (host-derived) were observed for both types of tetrathyridia and in both types of animals. To determine whether proliferous tetrathyridia in this genus could replicate in host capsules of the prairie rattlesnake (Crotalus viridis viridis), 11 snakes were inoculated and maintained in 2 environmental chambers (25 C and 30 C). One snake at each temperature was removed at 4-wk intervals and killed. Sections of the gastrointestinal tract and adjacent mesenteries were histologically examined. The increase in the numbers of tetrathyridia per capsule was significant at both 25 C (P = 0.007) and 30 C (P < 0.001). Identification of 7 intracapsular tetrathyridia with binary scoleces served as collaborative evidence. This paper presents the first significant evidence for asexual replication of the proliferous tetrathyridia (Mesocestoides sp.) in a reptilian host.

Animals↗
PubMed1993

Asexually proliferous tetrathyridia of Mesocestoides sp. in the hepatic portal system of the prairie rattlesnake (Crotalus viridis viridis).

A female prairie rattlesnake (Crotalus viridis viridis) was gastric intubated with 250 tetrathyridia of Mesocestoides sp. The snake was killed 12 wk postinfection; a portion of the liver was examined histologically for evidence of tetrathyridia. Five tetrathyridia were seen in two hepatic portal triad vessels. We propose that a blood-borne metastasis of tetrathyridia in reptiles and rodents may occur.

Animals↗
PubMed1991

Asynchronous capsule formation in the gastrointestinal tract of the prairie rattlesnake (Crotalus viridis viridis) induced by Mesocestoides sp. tetrathyridia.

The prairie rattlesnake (Crotalus viridis viridis) was experimentally infected with tetrathyridia of Mesocestoides sp. Individual snakes were killed at 4 wk increments, and sections of the stomach, small intestine, large intestine and attached mesenteries were examined for nonencapsulated and encapsulated tetrathyridia. Capsule formation was asynchronous with 9 to 80% encapsulated metacestodes. The distribution of tetrathyridia in the wall of all segments of the gastrointestinal tract is presented as evidence that this metacestode is principally a tissue dwelling parasite.

Animals↗
PubMed1985

Asexual multiplication of tetrathyridia of Mesocestoides corti in Crotalus viridis viridis.

Prairie rattlesnakes, Crotalus viridis viridis Rafinesque, 1818, were infected with tetrathyridia of Mesocestoides corti Hoeppli, 1925, by means of oral intubation. Snakes were maintained at constant temperatures of either 25, 30, or 35 C for 4-24 wk. Postmortem examinations revealed the first experimental evidence of asexual multiplication of tetrathyridia in a laboratory-infected ectothermic host. Time and temperature were statistically significant with P values of less than 0.05.

Animals↗
PubMed1970

Development of third-stage Physaloptera larvae from Crotalus viridis rafinesque, 1818 in cats with notes on pathology of the larvae in the reptile. (Nematoda, Spiruroidea).

The prairie rattlesnake, Crotalus viridis, was found to be commonly infected with third-stage Physaloptera larvae. A total of 112 larvae were fed to 3 laboratory raised cats. Adult worms recovered 42 and 59 days postinfection were identified as P. rara. Observations were made on the pathology of the larvae in the snake.

Animals↗