First molecular evidence of Anaplasma spp. co-infection in stray dogs from Anhui, China.

Anaplasma species are obligate intracellular pathogens that threaten the health of both humans and animals worldwide. This study aimed to determine the prevalence of Anaplasma species in stray dogs in Anhui Province, China. Blood samples from 201 apparently healthy stray dogs were collected from August 2017 to January 2018, and Anaplasma spp. infection in these dogs was evaluated by nested PCR and phylogenetic analysis. The overall infection rate of Anaplasma spp. in stray dogs was 38.3% (77/201). The prevalences of single infection of A. platys, A. phagocytophilum and A. ovis were 15.4%, 11.9%, and 8.5%, respectively. Co-infection rate of A. platys and A. phagocytophilum was 1.5% and that of A. platys and A. ovis was 0.5%. Co-infection by these three pathogens was found in one sample (0.5%). This is the first report of Anaplasma spp. infections in stray dogs from Anhui, China.