West Nile Virus Activity Data Table Updated 03/20/2025 2024 Alameda County WNV activity 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 California West Nile virus activity National West Nile virus information
