title: Infectivity and growth of Echinostoma revolutum (Froelich, 1802) in the domestic chick.
abstract: Infectivity and growth studies in domestic chicks were carried out on a strain of Echinostoma revolutum isolated from Lymnaea elodes snails in Indiana, U.S.A. Of 21 chicks, each fed 40 +/- 10 cysts of Echinostoma revolutum, 16 (64%) were infected with a total of 269 (32%) worms from approximately 840 cysts. Worms were found only in the ceca and rectum at 2-14 days p.i. In vivo excysted metacercariae were obtained in the lower ileum and ceca at 4 h p.i. Excysted metacercariae averaged 0.2 mm in length and 0.02 mm2 in body area. Worm length averaged 1.3 mm on day 6, 2.3 mm on day 8 and 3.6 mm on day 14. Mean body area averaged 0.29 mm2 on day 6, 0.62 mm2 on day 8 and 1.93 mm2 on day 14. Worms first became ovigerous on day 12. Growth of E. revolutum in the chick was delayed compared to previous findings on E. trivolvis, a closely related species of 37-collar-spined echinostome in the E. revolutum complex.
authors.affiliation: Department of Biology, Lafayette College, Easton, PA 18042, USA.
authors.forename: J E
authors.initials: JE
authors.lastname: Humphries
authors.forename: A
authors.initials: A
authors.lastname: Reddy
authors.forename: B
authors.initials: B
authors.lastname: Fried
mesh_terms: D000818:Animals; D002432:Cecum / Q000469:parasitology; D002645:Chickens / Q000469:parasitology*; D004449:Echinostoma / Q000254:growth & development* / Q000302:isolation & purification / Q000472:pathogenicity*; D004451:Echinostomiasis / Q000503:physiopathology*; D007196:Indiana; D008195:Lymnaea / Q000469:parasitology; D012007:Rectum / Q000469:parasitology; D013997:Time Factors