Figure 2. Annual surveillance of free-ranging cervids for chronic wasting disease (CWD). A) Number of US states and Canadian provinces conducting limited or extensive CWD surveillance of free-ranging cervids. B) Number of cervids tested by species each year/season. Other/unspecified includes black-tailed deer, moose, caribou, and data that could not be separated by species. C) Number of CWD-positive cervid samples (CWD cases) by species each year/season. Less than 5 moose were positive. Data were obtained from state and provincial wildlife agencies. Asterisks indicate preliminary or approximated 2010 data.