Toxoplasmose congênita em ovelhas reinfectadas experimentalmente
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Data
2012-02-03
Autores
Santos, Thaís Rabelo dos [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
O elevado índice de ovinos naturalmente infectados por Toxoplasma gondii, a grande possibilidade destes animais se reinfectarem com este protozoário e a inexistência de dados sobre a transmissão congênita em uma reinfecção, motivaram a realização deste projeto de pesquisa. O objetivo deste experimento foi estudar a transmissão congênita em ovelhas, infectadas e reinfectadas experimentalmente com oocistos de T. gondii, em três fases gestacionais. Vinte ovelhas em idade reprodutiva, sorologicamente negativas para T. gondii (RIFI-IgG), foram selecionadas e primoinfectadas experimentalmente com a cepa ME49 (Dia zero). Três carneiros, sorologicamente negativos para toxoplasmose, neosporose, leptospirose e brucelose, foram utilizados para monta natural (RIFI≤512). Posteriormente ao diagnóstico de gestação, estas ovelhas foram distribuídas em quatro grupos experimentais: GI - cinco ovelhas reinfectadas com T. gondii no 40º dia de gestação (DG), GII - cinco no 80º DG, GIII - cinco no 120º DG e GIV - cinco receberam solução salina no 120º DG (controle não reinfectado). Cinco fêmeas sorologicamente negativas (RIFI<64) para infecção toxoplásmica foram mantidas como controle negativo (não infectado) - GV. Sete dias antes da primoinfecção, imediatamente antes da inoculação, a cada três dias até o 30º dias pós-inoculação e a cada sete dias até o término da gestação, exames clínicos e pesquisa de anticorpos (RIFI-IgG) contra T. gondi foram realizados nas 25 ovelhas. Exames ultrassonográficos foram efetuados para diagnóstico de gestação, posteriormente à reinoculação, a periodicidade deste exame foi quinzenal. Amostras de sangue (soro), de todos os cordeiros provenientes das ovelhas experimentais foram obtidas, imediatamente após o nascimento, no 3º e 14º dia de idade, para...
The high occurrence of naturally infected sheep with Toxoplasma gondii, the great possibility of reinfection and the lack of data on congenital transmission in a reinfection were the motivation of this research project. The aim this study was evaluate the congenital transmission in experimentally reinfected and infected ewes, by oocysts T. gondii, in three pregnancies phases. Twenty ewes, negative serologically for T. gondii (indirect fluorescent antibody test-IgG), were selected and experimentally infected with ME49 strain (Day0). Three ram, negative serologically for toxoplasmosis, neosporosis, leptospirosis and brucellosis were used for natural mating (IFAT≤512). After the diagnosis of pregnancy, these ewes were distributed in four experimental groups: GI - five ewes reinfected with T. gondii on the 40th day of gestation (DG), GII - five in the 80th DG, GIII - DG 120th in five and GIV - five received saline solution in 120th DG (unreinfected). Five ewes, negative serologically (IFA <64) for T. gondii infection were kept as negative control (uninfected) - GV. Seven days before the first infection, immediately prior to inoculation, every three days until the 30th day after inoculation and every seven days until the end of pregnancy, clinical examinations and blood samples (IFAT-IgG against T. gondii) were performed in 25 ewes. Ultrasonographic examinations were performed in the diagnosis of pregnancy and fortnightly after reinfection. Serum samples, from all the lambs were obtained immediately after birth (pre-colostral), at 3 and 14 days of life, for T. gondii (IFAT-IgG). Parasitism by T. gondii was investigated (histopathology, mouse inoculation and PCR) in tissue fragments of female and fetuses, stillbirths and/or dead lambs after birth. Twenty ewes showed T. gondii antibodies specific on post-inoculation day (PID) 11. The most serological title... (Complete abstract click electronic access below)
The high occurrence of naturally infected sheep with Toxoplasma gondii, the great possibility of reinfection and the lack of data on congenital transmission in a reinfection were the motivation of this research project. The aim this study was evaluate the congenital transmission in experimentally reinfected and infected ewes, by oocysts T. gondii, in three pregnancies phases. Twenty ewes, negative serologically for T. gondii (indirect fluorescent antibody test-IgG), were selected and experimentally infected with ME49 strain (Day0). Three ram, negative serologically for toxoplasmosis, neosporosis, leptospirosis and brucellosis were used for natural mating (IFAT≤512). After the diagnosis of pregnancy, these ewes were distributed in four experimental groups: GI - five ewes reinfected with T. gondii on the 40th day of gestation (DG), GII - five in the 80th DG, GIII - DG 120th in five and GIV - five received saline solution in 120th DG (unreinfected). Five ewes, negative serologically (IFA <64) for T. gondii infection were kept as negative control (uninfected) - GV. Seven days before the first infection, immediately prior to inoculation, every three days until the 30th day after inoculation and every seven days until the end of pregnancy, clinical examinations and blood samples (IFAT-IgG against T. gondii) were performed in 25 ewes. Ultrasonographic examinations were performed in the diagnosis of pregnancy and fortnightly after reinfection. Serum samples, from all the lambs were obtained immediately after birth (pre-colostral), at 3 and 14 days of life, for T. gondii (IFAT-IgG). Parasitism by T. gondii was investigated (histopathology, mouse inoculation and PCR) in tissue fragments of female and fetuses, stillbirths and/or dead lambs after birth. Twenty ewes showed T. gondii antibodies specific on post-inoculation day (PID) 11. The most serological title... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Toxoplasmose em animais, Doenças hereditarias, Congenital toxoplasmosis
Como citar
SANTOS, Thaís Rabelo dos. Toxoplasmose congênita em ovelhas reinfectadas experimentalmente. 2012. xviii, 100 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2012.