In the United States, mosquitoes are known to spread West Nile virus, eastern equine encephalitis and, in recent months, chikungunya virus. These illnesses do not have specific vaccines or treatments, so prevention of mosquito bites throughout the fall months is crucial. It's still important for people to apply bug spray containing DEET, picaridin or oil of lemon eucalyptus when spending time outdoors. This alone will significantly decrease their chances of getting bitten by an infected mosquito. GGA Pest Management also recommends the following tips to avoid exposure to mosquitoes. Wear long pants, long-sleeved shirts and closed-toe shoes to protect the skin