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Vector-Borne Diseases

West Nile Virus Chikungunya Dengue Chikungunya Virus Ticks Eastern Equine Encephalitis Tick-Borne Diseases Mosquito-Borne Diseases Malaria Japanese Encephalitis Dengue Fever Asian Tiger Mosquito Mosquito Control West Nile Fever Lyme Disease Usutu Virus Miasis Transmission Mosquitoes Leptospirosis Mosquito-Borne Illnesses Mosquito-Borne Viruses Ticks and Tick-Borne Diseases Aedes aegypti Mosquitoes Aedes aegypti Mosquito Kissing Bugs Aedes aegypti La Crosse Encephalitis Virus Ross River Virus Tiger Mosquito Midge and Mosquito Transmission Mosquito-Borne Infections Oropouche Virus Eastern Equine Encephalitis (EEE) Disease Transmission Aedes Aegypti Blood Donation Safety Frühsommer-Meningoenzephalitis (FSME) Yellow Fever Japanese Encephalitis Virus Borreliose Screwworm Infestation Risks Screwworm Infestation Chikungunya Fever Tick-Borne Illnesses

Second West Nile Detection Confirmed in Hays County Mosquito Trap

State health officials confirmed a Nov. 4 Wimberley-area sample, prompting renewed county warnings on mosquito bite prevention.

L.A. County Confirms First West Nile Virus Death of 2025

New York Confirms First Locally Acquired Chikungunya Case in Nassau County

Invasive Aedes Aegypti Mosquito Confirmed in Boulder Creek as County Mounts Response

Roseville Man's Death Is Placer County's First West Nile Fatality of 2025, Fifth in California

Two More West Nile Cases in Massachusetts as 47 Communities Reach High Risk

NY Probes Possible Local Chikungunya Case as West Nile Activity Rises in Northeast and Midwest

South Carolina Confirms First Eastern Equine Encephalitis Death in More Than 20 Years

CDC Says Chagas Disease Is Now Endemic in the U.S.

Study Forecasts Rising Aedes Aegypti Across Brazil by 2080, With South and Southeast Hotspots

Albany County Confirms First West Nile Virus Case Since 2018

West Nile Season Intensifies With First LA Cases and Deaths Reported in Illinois and Michigan

Suspect Detained After Gunfire Hits Illinois Senator’s Home in Shorewood

U.S. West Nile Cases Climb to 771 as 2025 Season Runs 40% Above Normal

First Human West Nile Cases of the Season Confirmed in Connecticut, Long Island and Trumbull County

First Human West Nile Cases Confirmed in Massachusetts and Delaware County as Mosquito Positives Surge

New Jersey Confirms Two Human West Nile Cases as Northeast Activity Intensifies

West Nile Activity Intensifies With 2 Deaths in Minnesota and New Signals in New York, Maryland and Indiana

West Nile Virus Activity Intensifies With NYC’s First Human Cases and Maryland’s First of the Year

ECDC Flags 'New Normal' as Europe Sets Record Chikungunya Outbreaks, West Nile Reaches New Areas