West Nile virus was discovered in areas of Sunnyvale and Santa Clara by the Santa Clara County Vector Control District, which monitors human diseases transmitted by parasites, viruses and bacteria.
The vector control district manager, Nayer Zahiri, said that there have never been deadly cases of West Nile virus in Santa Clara County and that the number of cases of people has dropped in recent years.
Two dead American crows were tested positive for the disease last week, and officials were able to catch and examine mosquitoes in the area.
County officials said truck-mounted adult mosquito control will start treatment in affected areas containing postcodes 94085, 95051
Treatment begins at 23 Thursday and last about three hours, according to the district officials. Residents need not leave their homes during treatment, but may close windows and doors to avoid potential chemical sensitivity.
According to Zahiri, there were no human cases in Santa Clara County in 2017, but there was one in 2016. She attributed the high numbers in 2014 to very dry weather, saying birds would get the disease more often if they had limited water sources with mosquitoes divide. In the next few years, the virus will be predicted to multiply in the coming years, but Heat has been described as an important factor in mosquito breeding
The West Nile virus first came to California in 2003 and 292 people died in this state illness over the past 15 years, according to district officials. The state's record death toll in 2015 was 53 deaths.
Most people suffering from the disease have no symptoms, but some have fever and headaches, while severe cases cause neurological damage or death. 19659010] County officials said that people older than 50 years are at greatest risk from chronic diseases such as diabetes, cancer or kidney disease.
To prevent the disease being caused by mosquitoes, officials recommend tilting stagnant water where bugs can breed. Fit appropriate insect screens and use insect repellent properly. Zahiri said even small containers could have enough water for the beetles to breed.
Residents may also request free mosquito repellent services by calling the county (408) 918-4770.