Blood samples were taken from humans and several species of free-ranging wild mammals from five different geographic areas of Alberta, Canada. Sera were tested for antibody to eastern equine encephalitis (EEE) virus, western equine encephalitis (WEE) virus, St. Louis encephalitis (SLE) virus, Powassan (POW) virus, the snowshoe hare (SSH) strain of the California group (CAL) of viruses, Northway (NOR) virus, Klamath (KLA) virus, infectious bovine rhinotracheitis (IBR) virus, and two bacteria, Brucella abortus and Francisella tularensis. CAL antibody was found in 63% of 11 snowshoe hares (Lepus americanus), 33% of 167 black bears (Ursus americanus), and 19% of 55 humans (Homo sapiens). NOR antibody was found in 0.4% of 258 hares, 11% of 9 bighorn sheep (Ovis canadensis), 20% of 44 moose (Alces alces), 4% of 56 bears, 14% of 22 woodland caribou (Rangifer tarandus), and 2% of 50 humans. IBR antibody was detected in 14% of 14 moose. B. abortus antibody was found in 1% of 283 bears. F. tularensis antibody was detected in 2% of 52 humans. These findings represent extension of: (1) the natural host range for IBR, CAL, and NOR; (2) the geographical distribution of NOR infection in North America; and (3) the geographical distribution of CAL infection within Alberta.
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