In some species of birds, WNV-resistant populations may be emerging. Some surveys suggest that WNV may have reached its peak prevalence in the U.S., and the effects on bird species overall may be decreasing.
Birds including Baltimore orioles, chipping sparrows, eastern towhees, northern cardinals, and white-breasted nuthatches, do not seem to even be affected by WNV.
I’m glad you are seeing more birds this year. To learn more about West Vile or to report a sick bird county go to: www.michigan.gov/westnilevirus