After the most recent confirmed cases of West Nile Virus, in Yolo County, mosquito control officials are worried we are heading for a big outbreak.   And the hot weather has them even more concerned, since mosquitoes breed more and the virus spreads more efficiently in the heat.
William Reisen  is with the Center for Vector Borne Diseases at UC Davis:
 
The speed at which the virus will grow within the mosquito is directly related to temperature, just as if it was in a Petri dish in the laboratory.
 
 
Reisen says people who are out in the evening when mosquitoes are most active should wear long sleeves and pants, and apply a deet repellant.  And he says one portion of the population is especially vulnerable to mosquito bites – smokers, who may go outside at night to smoke, unprotected.