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West Nile Virus Activity

20112012201320142015201620172018201920202021202220232024
Birds015189719112200820821
Mosquitoes000161620150000220
Humans02010010000120

Updated 1/23/2024 

2023 Alameda County WNV activity

2021 Alameda County WNV activity

2020 Alameda County WNV activity

2018 Alameda County WNV activity

2017 Alameda County WNV activity

2016 Alameda County WNV activity

2015 Alameda County WNV activity

2014 Alameda County WNV activity

California West Nile virus activity

National West Nile virus activity