Since the West Nile virus (WNV) was first detected during 2003 in Maricopa County, Arizona, it has become endemic.
According to recent U.S. Centers for Disease Control and Prevention (CDC) data, the recent fifth WNV outbreak was the largest and generated the most significant number of related fatalities.
In 2021, Maricopa County, which includes the city of Phoenix, reported 1,487 WNV cases, 1,014 hospitalizations, and 101 (7%) deaths.
This unfortunate data compared with only 3 WNV cases in 2020.
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