West Nile Virus / Mosquito-Borne Diseases

West Nile virus is spread by the bite of an infected mosquito. It is widespread in Africa, southern Europe, and western Asia. It first appeared in the United States in 1999 and had spread to 44 states by 2002. It causes flu-like symptoms that can sometimes lead to severe illness and even death, especially in people over 50. West Nile virus is important because it affects not only people but also wildlife and some domestic animals such as horses.

Along with the Ohio Department of Health, the CDPH Division of Environment collects mosquitoes and sends them to the State Laboratory to be tested for West Nile virus and other diseases. The division then aggressively treats areas where the virus may be present.

West Nile virus infection can happen anytime during mosquito season, which is usually from May through October. During this time, Cleveland residents should be prepared and take precautions against mosquitoes by using bug spray, staying indoors especially during the early morning and early evening, wearing appropriate clothing, and draining any standing water in and around their homes.

For more information, please read our Fact Sheet or click the following links:
Other diseases that mosquitos carry and may occur locally in Ohio include:
There are also several diseases that Ohioans can get from mosquitos when traveling that could be brought back into Ohio:

* Ohioans traveling to areas where local transmission is occurring should be aware of the ongoing situation and make every effort to avoid mosquito bites. Additional information can be found from the Centers for Disease Control and Prevention (CDC)'s Travelers' Health and the Pan-American Health Organization website for
Zika and Chikungunya.

Mosquito-Borne Cases and Information from Neighboring States:

West Virginia:

Please do not hesitate to contact the Ohio Department of Health Zoonotic Disease Program at (614) 752-1029
if you have any questions.