Neosporosis, caused by Neospora caninum, a toxoplasma-like organism, is an important infectious disease of cattle worldwide. This infection causes abortion and neurological disorder in those animals. The definitive host is dog. The main mode of transmission is transplacental. The main diagnosis is by a immunohistochemical method. The vaccination for this disease is still controversial. Although there is some evidence of human infections from serological study, there is no in-depth study in human beings.