Anaplasma phagocytophilum is an emergent hemoparasite in regions where ticks are regularly found. In order to investigate the rate of anti-A. phagocytophilum antibody in horses of the Mounted Police of Rio de Janeiro state and therefore the presence of this agent. 41 horses from the Cavalry Squadron (CS) and 50 from the Regiment of Mounted Police (RMP) were selected. https://shopredoners.shop/product-category/mid-rise-wide-leg/