Five Santa Clara County residents found infected with West Nile Virus

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Mosquitoes cause more human casualties than any other organism– according to the AMCA (American Mosquito Control Association) over one million people worldwide die from mosquito-borne diseases every year.

Over the past few weeks, five Santa Clara County residents were found infected with West Nile virus. Two of the infected developed a severe neuroinvasive form that can lead to death. One is currently hospitalized.

West Nile virus in the South Bay area is not common–there were two cases in 2013, one in 2011, one in 2008, four in 2007, and five in 2006.

Unlike last year’s outbreak, West Nile virus activity was concentrated in Milpitas and East San Jose; this year it is concentrated in Mountain View, Sunnyvale, Santa Clara, Cupertino, Campbell, and west and south San Jose.

For now, health officials warn that the risk of the West Nile virus is on the rise for the next two months, the period it takes for the infected mosquitoes to die out.

“It is important to remember most people who get a mosquito bite will not become infected, will not develop symptoms and will not need to seek care,” said Dr. Sara Cody, Health Officer for Santa Clara County, in an official press release. “But in some cases, West Nile can cause serious illness. To reduce the risk of West Nile, residents should take precautions to avoid being bitten by mosquitoes.”

According to CDC (US Center for Disease Control,) the West Nile virus or WNV is an anthropod-borne virus (arbovirus); anthropods include insects, arachnids, and crustaceans. Documented throughout the world, WNV was first detected in North America in 1999, and has since spread across the continental US and Canada.

The majority of people get infected by West Nile Virus by a mosquito bite. The infected mosquitoes catch the virus by feeding on infected birds.

In 2014, Santa Clara experienced an unusually high number of birds that died from West Nile virus.

West Nile virus can easily be transmitted, but the risk of becoming seriously ill is low for most people. Less than one percent of people can develop serious neurologic illness like encephalitis or meningitis. However, those over the age of 50, people with diabetes, or those with hypertension have a higher chance of becoming ill.

People can take steps to protect themselves from contracting WNV including:

1. Use insect repellents when outdoors. Repellants containing DEET, picaridin, IR3535, and some oil of lemon, eucalyptus and para-menthane-diol products provide longer-lasting protection.

2. Dress in long sleeves and pants if possible.

3. Make sure window and door screens are secure.

4. Reduce the number of mosquitoes around your home by emptying standing water from open containers.

In response to the West Nile outbreak, San Jose, and Saratoga have been sprayed to eliminate the virus-carrying mosquitoes last week. Santa Clara and Sunnyvale were fogged the week before.

“I had no idea it was going on,” said Saratoga resident Victoria Ding (11), “I think we should take precautions, but [fogging] may not be the right answer.”

Fogging aims to eliminate all virus-carrying pests, but city officials say citizens should take precautions.