Neosporosis is one of the most common cause serious diseases in cattle and dogs worldwide, especially
causes of bovine abortion. The horizontal route of transmission from the definitive host occurs via ingestion of
oocysts contaminating the environment and/or tachyzoites and cysts in the carcass, placental tissues of the
infected hosts whereas, the vertical transmission happens when pregnant female whose tissue cysts are likely
to be activated during gestation. The present review is a comprehensive and up to date the situation of neosporosis
occurrence in Thailand, the epidemiology of disease and their associated risk factors. The application of variety
laboratory assays used in neosporosis diagnosis is also discussed.