The Ohio Department of Health (ODH) Zoonotic Disease Program, in partnership with ODH Laboratory, local public health partners and sanitary district partners, conducts statewide vectorborne disease surveillance which includes monitoring for human and veterinary cases.

We will monitor for diseases transmitted by mosquitoes and ticks throughout the summer and fall and will report positive results and summary statistics on this website, updated each Friday at noon.  Please download the attached document for a more detailed summary of mosquito and tick surveillance in Ohio.

2020 Numbers At-A-Glance

As of October 29, 2020

Mosquito-borne diseases

West Nile virus

La Crosse/Unspecified California encephalitis virus

Travel-associated mosquito-borne diseases

* 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 Pan-American Health Organization websites.

Tickborne diseases

Lyme disease, anaplasmosis, babesiosis

* Includes both passive and active tick surveillance as of 10/29/2020.

Rocky Mountain spotted fever

* Includes both passive and active tick surveillance as of 10/29/2020.

Ehrlichiosis

* Includes both active and passive surveillance as of 10/29/2020.