Abstract
Transplacental transmission of Neospora caninum was studied in 2 pregnant cats (queens). Queen 1 was inoculated subcutaneously with 2 x 10(6) cell culture-derived N. caninum tachyzoites on day 47 of gestation. She gave birth to a full-term kitten on the 17th day after inoculation. The kitten died the second day after birth due to generalized N. caninum infection. The mother cat was killed on the third day after parturition and was found to have a macerated kitten in the uterus. Severe placentitis, metritis, hepatitis, and nephritis due to N. caninum were seen in tissues from the queen. Queen 2 was fed N. caninum tissue cysts and mated 111 days later. She gave birth to 3 healthy full-term kittens. The kittens were necropsied at 2, 22, and 30 days of age. Neospora caninum was recovered from the organs and was seen in histologic sections in 1 of the 3 kittens. Results indicate that N. caninum can be transplacentally transmitted in cats during acute and chronic stages of infection. Neospora caninum-specific IgG antibodies were demonstrated in the sera of inoculated cats and nursing kittens.
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