In Oklahoma County and its neighbors, the public health focus remains primarily on:
West Nile Virus (WNV): Oklahoma consistently ranks among the states with the highest per-capita risk for West Nile. The Culex mosquito, which carries the virus, thrives in the suburban drainage systems and stagnant water common throughout the OKC metro. In 2025, the Oklahoma City-County Health Department confirmed local infections as early as mid-June.
Encephalitis Strains: While rarer than WNV, various strains of encephalitis, including St. Louis Encephalitis, are monitored due to the presence of compatible vectors in the Oklahoma River basin.
Oklahoma is nationally recognized for high rates of tick-borne bacterial infections. The “Big Three” in the OKC area are:
Rocky Mountain Spotted Fever (RMSF): This is the most significant tick-borne threat in Central Oklahoma. It is primarily transmitted by the American Dog Tick, which is ubiquitous in the tallgrass prairies and suburban parks around the metro.
Ehrlichiosis: Highly prevalent in Oklahoma County, this disease is spread by the Lone Star Tick. It often presents with flu-like symptoms and is a major focus for local healthcare providers during the spring.
Alpha-gal Syndrome (AGS): A rising concern in the region, this red-meat allergy is triggered by the bite of the Lone Star Tick. With OKCâs high density of these ticks in shaded residential yards, cases have seen a marked increase.
Lyme Disease: While historically more common in the Northeast, the Blacklegged Tick (Deer Tick) is present in the wooded creek corridors of Central Oklahoma, and Lyme cases are reported annually.
Lone Star Tick: The most aggressive tick in OKC; known for “hunting” its host rather than waiting passively.
American Dog Tick: The primary vector for RMSF; thrives in open, grassy areas and roadside vegetation.
Culex Mosquito: A “permanent water” breeder; the primary vector for West Nile Virus in urban Oklahoma City.
Asian Tiger Mosquito: An aggressive daytime biter common in OKC backyards; breeds in even the smallest amounts of water (like a bottle cap).