Serological evaluation of Anaplasma phagocytophilum infection in livestock in northwestern Spain.

A total of 1,098 serum samples were analyzed against Anaplasma phagocytophilum by immunofluorescent antibody (IFA) test. These serum samples belonged to four different populations distributed throughout two provinces of Galicia (Ourense and Pontevedra) located in northwestern Spain: bovine population (456 samples); ovine population (389 samples); caprine population (207 samples); and equine population (46 serum samples, all from Pontevedra). The seroprevalence against A. phagocytophilum within the bovine population was 3.07%. On the other hand, two of 389 (0.51%) sheep and one of 207 (0.48%) goats tested were seropositive, all of them showing low antibody titer. Seroprevalence within the equine population was 6.52% (3/46). Our results reveal the presence of antibodies against A. phagocytophilum in livestock from northwestern Spain, mainly in Pontevedra.