Ohio Vectorborne Disease Surveillance Update

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.

As of July 11, 2024

2024 Mosquito-borne Diseases

West Nile Virus

Mosquito surveillance:

Mosquitoes tested from 62 agencies in 52 counties, pooled into 4,817* samples.

West Nile virus positive mosquitoes from 12 counties:

Clermont (1), Delaware (1), Franklin (15), Geauga (1), Hamilton (3), Hancock (3), Lorain (3), Ottawa (2), Richland (1), Stark (8), Summit (8), Tuscarawas (2).

* In addition to samples tested by the Ohio Department of Health, Franklin County Public Health, Columbus Public Health, and Licking County Health Department test some of their samples.

Human surveillance:

West Nile virus human cases.

Asymptomatic, viremic blood donors.

Asymptomatic, viremic organ donors.

Veterinary surveillance:

West Nile virus avian case.

West Nile virus equine cases.

La Crosse/California encephalitis virus

Human surveillance:

La Crosse virus human cases.

Travel-associated mosquito-borne diseases

Chikungunya surveillance:

Chikungunya human cases.

Sexes:

Ages:

Traveled to 2 countries:

Ecuador (1), India (1).

Dengue surveillance:

Dengue human cases.

Sexes:

Ages:

Traveled to 10 countries:

Barbados (1), Brazil (2), Curacao (3), Dominican Republic (1), Mexico (2), Nicaragua (1), Peru (1), Puerto Rico (1), St. Barthelemy (1), Thailand (1).

Zika surveillance:

Zika human cases.

Malaria surveillance:

Malaria human cases.

Sexes:

Ages:

Traveled to 17 countries:

Burkina Faso (1), Cameroon (5), Colombia (1), Congo DRC (1), Congo (4), Ethiopia (1), Ghana (2), Guinea (1), Kenya (3), Liberia (3), Mexico (1), Nigeria (5), Sierra Leone (7), Tanzania (4), Togo (1), Uganda (2), Venezuela (1), unknown African country (1), unknown country (2).

* 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.

2024 Tickborne Diseases

Lyme disease, anaplasmosis, babesiosis

Tick surveillance:

Blacklegged ticks identified.

From 42 counties:

Ashland (1), Ashtabula (3), Athens (10), Butler (5), Carroll (2), Clark (2), Columbiana (3), Coshocton (1), Cuyahoga (5), Erie (1), Fairfield (24), Fayette (1), Franklin (53), Gallia (1), Geauga (1), Greene (5), Guernsey (57), Hamilton (4), Harrison (34), Highland (1), Hocking (15), Holmes (195), Huron (1), Jefferson (2), Knox (1), Licking (165), Lorain (1), Mahoning (1), Medina (4), Meigs (1), Monroe (3), Muskingum (16), Perry (26), Portage (1), Richland (2), Scioto (1), Shelby (1), Stark (9), Summit (18), Tuscarawas (32), Washington (2), Wayne (2), unknown county (1).

Lyme disease human surveillance:

Lyme disease human cases.

Sexes:

Ages:

From 52 counties:

Ashland (2), Athens (2), Belmont (5), Butler (2), Carroll (3), Champaign (1), Clark (3), Clermont (5), Columbiana (17), Coshocton (7), Cuyahoga (10), Darke (1), Delaware (1), Erie (1), Fairfield (4), Franklin (13), Gallia (1), Greene (1), Guernsey (5), Hamilton (7), Harrison (3), Hocking (8), Holmes (8), Jackson (8), Jefferson (8), Knox (15), Lake (1), Lawrence (2), Licking (22), Lorain (2), Lucas (1), Madison (1), Mahoning (3), Medina (7), Meigs (2), Monroe (1), Morgan (2), Morrow (1), Muskingum (6), Noble (3), Perry (1), Pike (1), Portage (2), Richland (3), Scioto (1), Stark (15), Summit (7), Trumbull (7), Tuscarawas (8), Vinton (1), Washington (6), Wayne (7).

Anaplasmosis human surveillance:

Anaplasmosis human cases.

Sexes:

Ages:

From 2 counties:

Coshocton (1), Cuyahoga (1).

Babesiosis human surveillance:

Babesiosis human case.

Sexes:

Ages:

From 1 county:

Summit (1).

Rocky Mountain spotted fever (RMSF)

Tick surveillance:

American dog ticks identified.

Human surveillance:

RMSF human cases.

Sexes:

Ages:

From 2 counties:

Athens (1), Jackson (4).

Ehrlichiosis

Tick surveillance:

Lone Star ticks identified.

Human surveillance:

Ehrlichiosis human cases.

Sexes:

Ages:

From 3 counties:

Gallia (1), Jackson (2), Warren (1).

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