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PINELLAS COUNTY, Fla. -- Pinellas County Mosquito Control received results confirming positive results for St. Louis encephalitis in two sentinel chickens.

One was at Walsingham Park in Seminole and one in Cross Bayou in unincorporated Seminole area.

Sentinel chickens serve as an early-warning detection system for some mosquito-borne diseases and can signal the fact that mosquitoes carrying the diseases are present in the area. There are eight locations in the county where chickens are kept and tested weekly.

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Mosquito Control technicians are aggressively treating known breeding areas by ground and by air, as well as responding to requests from residents. Additional fogging is ongoing in these areas.

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St. Louis encephalitis differs from chikungunya, which is not detected in sentinel chickens but which is also transmitted by mosquitoes. There have been three confirmed cases of chikungunya in Pinellas County this year, none of which were locally acquired, but which were imported from the Caribbean.

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The public is urged to be diligent in ridding their properties of standing water to prevent mosquitoes breeding. Here are some precautions:

  • Empty water from old tires, flowerpots, garbage can lids, recycling containers, boat tarps and buckets. Eliminate standing water near plumbing drains, air conditioner drips, septic tanks or rain gutters
  • Flush birdbaths and wading pools weekly. Flush bromeliads twice weekly or treat with a biological larvicide.
  • Change the water in outdoor pet dishes daily.
  • Keep pools adequately chlorinated.
  • Stock ornamental ponds with mosquito-eating gambusia fish.
  • Cover rain barrels with fine mesh screening.
  • Repair rips or tears in door and window screens.
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