West Nile virus alert goes up in Merced
News that mosquitoes near Merced College have tested positive for West Nile virus last week put many on alert.
West Nile virus is most often spread by the bite of an infected mosquito.
The risk of serious illness from West Nile virus is low. About 1 percent of those infected can develop a serious neurological illness, such as encephalitis or meningitis. But most people will not show any symptoms, and about 1 in 5 who become infected will display symptoms such as fever, headache, body aches, nausea and vomiting, according to the California Department of Public Health.
Symptoms generally last for a few days.
According to health officials, older adults have a higher chance of getting sick and are more likely to develop complications. People with diabetes or hypertension also are at greater risk.
Last year, one human case of West Nile virus was confirmed in Merced County. In 2013, 13 human cases were found in the county.
Earlier this year, the state health department announced that 2014 was a hot year for West Nile activity. California recorded 801 human cases of the disease, of which 31 resulted in deaths, according to the department. It was the second greatest number of human cases of West Nile virus, and the largest number of deaths, since the virus first came into California in 2003.
So far this year, no human cases have been confirmed in the state, but 31 counties have detected virus activity.
The rising temperatures are a concern for the Merced County Mosquito Abatement District, as mosquitoes tend to replicate faster in warm temperatures.
The abatement district began spraying the grounds at Merced College last week with mosquito control treatment. Staff applied the first aerial treatment also last week over north Merced.
At a glance
To prevent exposure to mosquito bites and West Nile virus:
- Apply insect repellent containing DEET, picaridin, oil of lemon eucalyptus or IR3535 according to label instructions. DEET can be used safely on infants and children age 2 months and older.
- Wear protective clothing and repellent if outside at dawn and dusk when mosquitoes are most active. Make sure doors and windows have tight-fitting screens to keep out mosquitoes. Repair or replace screens with tears or holes.
- Eliminate or drain all sources of standing water where mosquitoes can lay eggs. Report neglected swimming pools to mosquito and vector control agencies.
Source: California Department of Public Health
This story was originally published July 5, 2015 at 11:03 AM with the headline "West Nile virus alert goes up in Merced."