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Title:   Author  item
                                            BASSO, W - UNIV LA PLATA, ARGENTINAitem
                                            VENTURINI, L - UNIV LA PLATA, ARGENTINAitem
                                            VENTURINI, M - UNIV LA PLATA, ARGENTINAitem
                                            Hill, Doloresitem
                                            Kwok, Oliveritem
                                            Shen, Samuelitem
                                            Dubey, Jitender
  Submitted to: Journal of Parasitology
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 6/15/2001
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary: Neospora caninum is a single-celled parasite of livestock and companion animals.  It causes abortion in livestock.  It is a major cause of abortion in dairy cattle in the United States. The source of Neospora infection in cattle is not fully known. Scientists at the Beltsville Agricultural Research Center and the  University in La Plata, Argentina have demonstrated the resistant stage (oocysts) of N. caninum in the feces of a naturally- infected dog for the first time.  These results will be of interest to biologists, parasitologists, veterinarians and farmers.
                                Technical Abstract: Neospora caninum is a major cause of abortion in cattle worldwide.  Cattle become infected with N. caninum by ingesting oocysts from the environment or transplacentally from dam to fetus.  Experimentally, dogs can act as definitive hosts, but dogs excrete few oocysts after ingesting tissue cysts.  A natural  definitive host was unknown until now.  In the present study, N. caninum was isolated from the feces of a dog.  Gerbils (Meriones unguiculatus) fed feces from the dog developed antibodies to N. caninum in the Neospora caninum-agglutination test and tissue cysts were found in their brains.  Neospora caninum was isolated in cell culture and in gamma interferon gene knockout mice inoculated with brain homogenates of infected gerbils.  The DNA obtained from feces of the dog, from the brains of gerbils fed  dog feces, and from organisms isolated in cell cultures inoculated with gerbil brains, was confirmed as N. caninum.  The identification of N. caninum oocyst by bioassay and PCR demonstrates that the dog is a natural definitive host for N. caninum.


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