[REVISION HISTORY]

West Nile virus surge in North America, Europe, and Balkans

Updated 72 times since CLSTR started tracking revisions of this situation.

What changed

2026-10-02 04:59 UTC → 2026-10-03 08:38 UTC · added ~~removed~~

Public health agencies in North America, Europe, and the Balkans continue to report West Nile virus activity. In the United States, the CDC has reported 813 human cases across 43 states. Los Angeles County continues to face a significant surge with 100 cases and five deaths, a volume officials note is comparable to levels seen in 2017 and represents the highest early-season count in nearly a decade. ~~Many patients in the county have required urgent hospitalization due to severe symptoms affecting the brain or spinal cord.~~ New activity has been reported in other U.S. states. In North Carolina, a resident in Forsyth County has tested positive following mosquito detections in Forsyth, Cabarrus, and Mecklenburg counties. In Illinois, health officials confirmed the death of an 86-year-old man in Shelby County; the state has recorded 50 human cases and three ~~deaths,~~ deaths. In the Northeast, New Jersey has confirmed its first death of 2026, with 26 total cases reported statewide; 19 of these individuals experienced neurological illness. In New York City, human cases have already surpassed the ~~virus detected in mosquitoes across 59 counties.~~ 2025 total, with 23 cases confirmed as of September, 18 of which were identified as West Nile neuroinvasive disease. In California, two sentinel chickens in ~~the Copperopolis area of~~ Calaveras County tested positive on September 25, ~~2026, indicating active mosquito transmission despite no local human cases reported this year. In Maryland, health officials confirmed the state’s first human case of 2026 occurred in July.~~ 2026. In Canada, CK Public Health confirmed the first positive virus identification ~~from a local trap~~ in Tilbury on September 15. European activity ~~includes the Netherlands, where the National Institute for Public Health and the Environment reported 44 cases and five deaths.~~ remains high. In Spain, ~~Andalusia remains active; a new case in San Telmo, Cortegana, brings the regional total to 69 cases. Several municipalities~~ cases are rising in ~~the Huelva province remain under alert to reinforce surveillance. In the Balkans, Greece has recorded 33 deaths, North Macedonia has reached 10 deaths, Romania~~ southern regions; Andalusia has ~~reported 95~~ confirmed 70 total cases and ~~five~~ four deaths, ~~and Kosovo has~~ including an 84-year-old man from La Puebla del Río. In Extremadura, the Servicio Extremeño de Salud reported ~~seven~~ 64 cases and two ~~deaths.~~ deaths so far in 2026, a significant increase from 2025. Other active areas include the Netherlands, Greece, North Macedonia, Romania, and Kosovo.

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