West Nile Virus has continued to be detected across Ohio with increasing frequency.
Click for printable PDF –> Summary table – 7 24 17-11ppnlr
Data courtesy of Ohio Department of Health, used with permission
The Centers for Disease Control and Prevention(CDC) released the statistics for 2017 YTD:
Provisional Data as of July 5, 2017
Zika virus disease became a nationally notifiable condition in 2016. Cases are reported to CDC by state, territorial, and local health departments using standard case definitions. This webpage contains cumulative provisional data reported to ArboNET for January 1, 2015 – July 5, 2017.
Transmission of Powassan Virus from infected ticks has been found to be much shorter in mice than for other tick vectored diseases.
Infected deer ticks (Ixodes scapularis) were allowed to attach to naive mice for variable lengths of time to determine the duration of tick attachment required for Powassan (POW) virus transmission to occur. Viral load in engorged larvae detaching from viremic mice and in resulting nymphs was also monitored. Ninety percent of larval ticks acquired POW virus from mice that had been intraperitoneally inoculated with 10(5) plaque-forming units (PFU). Engorged larvae contained approximately 10 PFU. Transstadial transmission efficiency was 22%, resulting in approximately 20% infection in nymphs that had fed as larvae on viremic mice. Titer increased approximately 100-fold during molting. Nymphal deer ticks efficiently transmitted POW virus to naive mice after as few as 15 minutes of attachment, suggesting that unlike Borrelia burgdorferi, Babesia microti, and Anaplasma phagocytophilum, no grace period exists between tick attachment and POW virus transmission.
Ohio Arbovirus Surveillance Update June 19, 2017
This is the first arbovirus surveillance update of the year, and we have already detected West Nile virus (WNV) activity. Of the 743 pooled mosquito samples tested so far, 3 have tested positive. These were collected in Franklin, Lorain and Summit Counties. This is similar in timing to our first positive samples last year, but we’re also seeing reports of WNV activity in neighboring states that includes an equine case in Kentucky and 2 human cases in Indiana. It is still too early in the surveillance season to predict whether or not this will be a worse than normal year. However, these reports serve as a reminder that WNV infected mosquitoes are active and now is the time to increase your community and public education efforts to include these points: