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Symptoms of EEE begin with the sudden onset of headache, high fever, chills and vomiting about four to 10 days after the bite of an infected mosquito, according to the Centers for Disease Control and Prevention. The illness could then progress into disorientation, seizures and coma.

About five to 10 cases of EEE are reported in the U.S. annually, and about a third of the patients who develop it die, according to the CDC. Many who survive end up having mild to severe brain damage.

\"PHOTO:
Joe Raedle/Getty Images, FILE
PHOTO: A Miami-Dade County mosquito control inspector sprays pesticide to kill mosquitoes in the Miami Beach neighborhood on Aug. 24, 2016 in Miami Beach, Fla.
>

Coops of sentinel chickens are placed in areas believed to be endemic to mosquitoes and are tested regularly for mosquito-borne viruses such as West Nile, according to the American Veterinarian. While the chickens show the presence of the viruses, they don't develop the symptoms associated with them.

Often, when a sample comes up positive, county health officials will increase spraying and conduct door-to-door surveys in the immediate area.

\"PHOTO:
Tim Boyle/Getty Images, FILE
PHOTO: A lab assistant places a mosquito into a test tube to be tested for diseases including the West Nile Virus, Saint Louis Encephalitis, and Eastern Equine Encephalitis, June 20, 2003, in Wheeling, Ill.
>

Orange County's Department of Health advised residents to drain standing water -- from garbage cans, house gutters, buckets, pool covers, coolers, toys, flower pots and any other container where water from a sprinkler or rain has collected -- to prevent mosquitoes from multiplying.

Residents were also advised to protect themselves with clothing, such as long pants and sleeves, and mosquito repellent on bare skin.

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