Eurytrema coelomaticum (Giard et Billet, 1892) Looss, 1907: alguns aspectos do seu relacionamento com os hospedeiros intermedi?rios e definitivo sob condi??es experimentais

Autor: Mattos Junior, Dalton Garcia de
Přispěvatelé: Amato, Suzana Bencke, Brito, Deocl?cio Bezerra, Rezende, Hugo Edison Barboza de
Jazyk: portugalština
Rok vydání: 1987
Předmět:
Zdroj: Biblioteca Digital de Teses e Dissertações da UFRRJ
Universidade Federal Rural do Rio de Janeiro (UFRRJ)
instacron:UFRRJ
ISSN: 1479-4969
Popis: Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2020-10-27T14:14:37Z No. of bitstreams: 1 1987 - Dalton Garcia de Mattos Junior.pdf: 1074177 bytes, checksum: 2fbf5e1479496961bca4d9fb4af97298 (MD5) Made available in DSpace on 2020-10-27T14:14:37Z (GMT). No. of bitstreams: 1 1987 - Dalton Garcia de Mattos Junior.pdf: 1074177 bytes, checksum: 2fbf5e1479496961bca4d9fb4af97298 (MD5) Previous issue date: 1987-05-28 Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq The life cycle of Eurytrema coelomaticum (Giard et Billet, 1892) was studied with the following objetives: a) to analyze the development of the trematode within its intermediate hosts; b) to identify its second intermediate host, in nature and in laboratory; c) to evaluate the worm prevalence in its intermediate hosts; d) to describe the effect of the intramolluscan stages upon the digestive and the reproductive systems of the first intermediate host. Land snails, Bradybaena similaris, were experimentally infected with eggs of E. coelomaticum and the intramolluscan stages were described. The morphology of expelled sporocysts appeared to be constant and could allowed the characterization of the species. The number of expelled sporocysts produced in each snail showed a large variation. Orthopterans of the families Gryllidae, Acridiidae and Tettigoniidae were captured in Lorena and Pindamonhangaba, in the Para?ba River Valley, S?o Paulo, and examined for metacercarie of E. coelomaticum. Only two species of tettigoniids of the genus Conocephalus were found xxii. harboring metacercariae of E. coelomaticum in the hemocoele. Experimental infective of these tettigoniids further supported their identification as E. coelomaticum second intermediate host. Therefore Conocephalus saltador and Conocephalus sp. were identified as the second intermediate host of E. coelomaticum for the first time in Brazil. Heterozigous nude mice Balb/c, Whistar stain rats and goats were experimentally infected by using infected C. saltador, or the metacercariae dissected from these insects. Only the goats acquired the infection. The specimens collected from the goats were much smaller than those found in the bovine host. The prevalence of E. coelomaticum in B. similaris in the properties surveyed ranged between 9.75% and 20.15%, while in Conocephalus it ranged between 0.62% and 70%. The histopathology found in the molluscan host showed that the alterations observed in the digestive gland and in the ovotestis were caused by mechanical pressure from the multiplying larvae. O ciclo biol?gico do Eurytrema coelomaticum (Giard et Billet, 1892) foi estudado com os seguintes objetivos: a) analisar o desenvolvimento do tremat?deo nos hospedeiros intermedi?rios; b) identificar o segundo hospedeiro intermedi?rio na natureza e no laborat?rio; c) avaliar a preval?ncia do parasito nos hospedeiros intermedi?rios; d) estudar as altera??es causadas pelo tremat?deo no molusco hospedeiro. Exemplares de Bradybaena similaris foram infectados, experimentalmente, com ovos de E. coelomaticum, e as larvas desenvolvidas neste hospedeiro, foram estudadas morfologicamente, notando-se que a morfologia dos esporocistos expelidos pode caracterizar a esp?cie E. coelomaticum. O n?mero de esporocistos expelidos por caramujo variou muito. Ort?pteros das fam?lias Gryllidae, Acridiidae e Tettigoniidae foram capturados nos munic?pios de Lorena e Pindamonhangaba, SP, e examinados ? procura de metacerc?rias de E. coelomaticum. Apenas duas esp?cies de esperan?as, os tettigoni?deos Conocephalus saltator e Conocephalus sp. albergavam metacerc?rias de E. coelomaticum. Infec??o experimental destes xx. insetos, com esporocistos expelidos de B. similaris infectados experimentalmente, comprovaram serem estes tettigoni?deos o segundo hospedeiro intermedi?rio de E. coelomaticum, o qual foi identificado pela primeira vez, no Brasil. Infec??es experimentais feitas em camundongos albinos linhagem Balb/c normal, em ratos linhagem Whistar e em cabras, utilizando-se esperan- ?as infectadas experimental e naturalmente, bem como com metacerc?rias dissecadas destes insetos, apresentaram resultados positivos apenas nas cabras. Os exemplares de E. coelomaticum coletados das cabras experimentalmente infectadas eram bem menores do que os normalmente coletados em bovinos. A preval?ncia m?dia de E. coelomaticum em B. similaris, nos munic?pios estudados variou entre 9,75% e 20,15%, enquanto que em Conocephalus variou entre 0,62% e 70%. As altera??es histopatol?gicas encontradas no molusco hospedeiro intermedi?rio foram causadas pela compress?o das larvas que atingiam principalmente a gl?ndula digestiva e a ovotestis.
Databáze: OpenAIRE
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