West Nile Virus activity
wanes as temperatures drop, but the Marin/Sonoma Mosquito and Vector Control
District announced this week that five more infected birds—one in San
Rafael—tested positive.
That brings a total of
five WNV-positive birds in Marin County this year - in San Rafael, Novato,
Ross, Corte Madera and Greenbrae - but the number isn’t expected to rise by
much this year.
“During the summer is
when WNV transmission is most likely to occur due to the abundance of vector
mosquitoes as well as the warmer weather,” said Nizza Sequeira, the district’s
public relations director. “We actually do have mosquitoes year round in both
Marin and Sonoma counties but they are most abundant during the spring and
summer months and begin to taper off into fall.”
That’s not to say all
mosquito activity comes to a halt.
“As we enter the cooler
months mosquitoes are not as active but will continue to reproduce,” said
Sequeira. “For example, we will see more of what we call the cool-weather
mosquito (Culiseta incidens) and the large winter mosquito (Culiseta
inornata).”
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