SNAP® 4Dx® Plus (IDEXX Laboratories, Westbrook, ME) is a commercially available in-office test kit for the simultaneous detection of Dirofilaria immitis antigen and antibodies to Anaplasma phagocytophilum, A. platys, Borrelia burgdorferi, Ehrlichia canis, and E. ewingii in blood, plasma, or serum of dogs. AccuPlexTM4 test (ANTECH Diagnostics®, Irvine, CA) is a recently launched reference labora...