Powassan Virus in Mammals, Alaska and New Mexico, USA, and Russia, 2004–2007
Figure 1. . Worldwide distribution of previously confirmed Powassan virus activity. Dots indicate approximate locations of known Powassan virus circulation as shown by human illness, virus isolation from animals, and Powassan virus–specific antibodies in humans or animals. Stars indicate approximate locations of antibody-positive animals, reported herein, collected during 2004–2007 and from whom samples were tested by using a strip immunoblot assay.