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- W1997360997 abstract "Neospora caninum was isolated from a naturally infected sheep from Brazil by bioassay in dogs. Approximately 70 g of brain from each of two 4-month-old sheep with indirect fluorescent antibodies (≥1:50) to N. caninum was offered to a different IFAT negative dog (Sheep n. 302, IFAT 1:400—Dog 1 and Sheep n. 342, IFAT 1:50—Dog 2). Parasite DNA was detected in both sheep brains using a PCR targeting the Nc-5 gene of N. caninum. Shedding of Neospora-like oocysts was noticed only in Dog 1, from 10 days post-inoculation (PI) to 25 days PI (a total of approximately 27,600 oocysts). Seventy days after infection, Dog 1 was euthanized and brain/cerebellum and medulla were collected and submitted to molecular methods, as were the oocysts, to confirm the identity of the isolate. Serum samples collected weekly from both dogs from the infection to the end of the experimental period had no antibodies anti-N. caninum by IFAT (<1:50). Oocysts, brain/cerebellum and medulla specimens of Dog 1 proved positive by a PCR assay targeting the Nc-5 gene of N. caninum. In addition, the oocysts have the DNA amplified by a PCR based on primers directed to the common toxoplasmatiid ITS1 sequence. The PCR products of ITS1 were sequenced, confirming again the isolate as N. caninum. Oocysts were also orally inoculated in two Swiss white mice two Mongolian gerbils (Meriones ungulatus) and two large vesper mice (Calomys callosus) (103 oocysts/animal). The rodents were sacrificed 2 months PI, and fresh preparations of brains showed Neospora thick-walled cysts in gerbil brains, but molecular detection using the Nc-5 PCR assay revealed DNA parasite in gerbil and also C. callosus brains. This is the first report of isolation and sequencing of N. caninum from a Brazilian sheep and the first report of molecular detection of N. caninum from C. callosus." @default.
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- W1997360997 date "2007-06-01" @default.
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- W1997360997 title "Isolation and molecular detection of Neospora caninum from naturally infected sheep from Brazil" @default.
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- W1997360997 doi "https://doi.org/10.1016/j.vetpar.2007.03.002" @default.
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