Number* of reported cases of babesiosis, by county of residence — 40 states, 2020^¶Δ

* N = 1826; county of residence was known for all but 1 (<1%) of the 1827 total case-patients.

¶ Year as reported by the health department.

Δ 2020 data may be lower or higher than previous years. COVID-19 likely had an impact on public health activities including case identification, case investigations (limited case investigations or none), as well as possibly impacting transmission rates. This may reflect the impact of isolation and prevention measures, whether people sought health care when they were ill, and other changes in behavior during the COVID-19 pandemic period.