Final 2020 Ohio Vector-borne Disease Update November 4, 2020

As we are moving out of mosquito season and into colder weather, this will be the last Vector-borne Disease Update of the year. Vector-borne disease information will continue to be updated on the Ohio Department of Health website and more details can be found at: www.odh.ohio.gov/vectorupdate.

Below is a summary of arbovirus activity in the state.

As of 10/29/2020, mosquito collection data has been shared by local partners in Ashland, Athens, Carroll, Clark, Clermont, Crawford, Cuyahoga, Fairfield, Franklin, Gallia, Greene, Hamilton, Hancock, Hocking, Lake, Licking, Lorain, Lucas, Mahoning, Medina, Meigs, Miami, Montgomery, Muskingum, Perry, Pickaway, Portage, Richland, Ross, Scioto, Shelby, Stark, Summit, Tuscarawas, Union, Vinton and Wood counties. The following are results of pooled mosquito samples tested for West Nile virus (WNV):

  • Clark County: 13,495 total mosquitoes tested; 22 positive samples
  • Crawford County (including Galion City): 45 total mosquitoes tested; 1 positive sample
  • Cuyahoga County: 1,057 total mosquitoes tested; 2 positive samples
  • Fairfield County: 1,784 total mosquitoes tested; 1 positive sample
  • Franklin County (including Columbus City): 128,198 total mosquitoes tested; 543 positive samples
  • Hamilton County (including Cincinnati City): 1,643 total mosquitoes tested; 4 positive samples
  • Lake County: 4,642 total mosquitoes tested; 12 positive samples
  • Lucas County: 6,375 total mosquitoes tested; 68 positive samples
  • Portage County (including Kent City): 13,028 total mosquitoes tested; 2 positive samples
  • Richland County (including Shelby City): 16,592 total mosquitoes tested; 4 positive samples
  • Summit County: 2,311 total mosquitoes tested; 2 positive samples
  • Union County: 4,319 total mosquitoes tested; 5 positive samples

This brings the total number of WNV positive mosquito samples in Ohio to 666.

As of 11/02/2020, the Ohio Department of Health reported 2 human cases of WNV. Cases include 2 males between the ages of 41 -62 years (median: 52 years) reported from Franklin (1) and Montgomery (1) counties with onset of symptoms between 08/25/2020 – 09/11/2020. There are several additional suspect cases under investigation.

The Ohio Department of Health also reported 30 cases of La Crosse virus. Cases include 19 males and 11 females between the ages of 3 -15 years (median: 7 years) reported from Ashland (1), Carroll (1), Coshocton (2), Delaware (2), Fairfield (1), Hamilton (1), Harrison (1), Hocking (2), Holmes (5), Licking (1), Logan (1), Marion (2), Perry (1),  Pickaway (1), Summit (2), Trumbull (1), Warren (1), Washington (2) and Wayne (2) counties with onset of symptoms between 07/02/2020 – 09/23/2020. There are several additional suspect cases under investigation.

 

Contact the Ohio Department of Health Zoonotic Disease Program (614-752-1029, option 1) if you have any questions.