Cases of the West Nile virus have also been reported this year in Hungary, Romania and Serbia, according to data from the European Centre for Disease Prevention and Control. Mosquitoes rest in these areas in hot daylight hours. No Yolo County residents have been diagnosed with the virus thus far this year.
"That is why we are warning the public", an official said.
Since the beginning of the year, 60 cases, 16 people are still in the hospital, four of them in intensive care.
About 80 per cent of people bitten by an infected mosquito don't show any symptoms at all, Miller said.
According to the CDC, 8 out of 10 individuals who become infected with WNV do not experience any symptoms; however, 1 in 5 will develop a fever and other symptoms such as headache, aches, joint pain, diarrhea, vomiting and fatigue, which can persist for weeks to months.
Older adults and those with compromised immune systems are at greater risk of developing central nervous system illness that can be fatal.
Encephalitis is an acute inflammation or swelling of the brain because of a viral infection. "You need to take precautions".
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"But thankfully there was no neurological condition in that patient", said Sookoo.
Limit time spent outside at dawn and dusk, when mosquitoes are most active.
Wear long sleeves and trousers or wear repellent to help protect yourself from getting bitten.
Use mosquito repellant (Use Environmental Protection Agency (EPA)-registered insect repellents).
Drain Standing Water - Many mosquitoes lay their eggs in standing water.
Officials say they expect to continue to see increased West Nile activity throughout the state. Although it may be hard to do when it's hot, wearing long-sleeves, long trousers and socks when outdoors will help keep mosquitoes away from your skin.
If clusters of dead birds or animals are found, Hastings Prince Edward Public Health should be notified.