May 27, 2005
Eileen Shields, Public Information Officer,
West Nile Virus Season Approaching
City Advises Residents to Report and Eliminate Mosquito Breeding Areas
San Francisco, CA—The welcoming warm weather of late spring also means
that mosquito season has begun. With the increase in mosquito activity
comes the threat of West Nile Virus. Mosquitoes multiply quickly and
under conditions that are found throughout San Francisco: warm
temperatures and standing or still water will produce an abundance of
mosquitoes within a very short time period.
San Francisco is a unique mosquito breeding grounds. The chilly summer
fog that blankets the City from June through October helps deter much of
the mosquito population in some areas, but the microclimates found in
other neighborhoods provide a warm welcome to mosquitoes anywhere water
San Francisco health officials, along with other city agencies, are
using the advent of warm weather to once again remind residents that
prevention goes a long way to protecting their own health and the health
of those they love.
Because mosquitoes can grow in any puddle of water that stands for more
than four days, here are a number of ways to eliminate as many sources
of standing water as possible:
- Get rid of containers (no matter how small) that have standing water
- Check and clear gutters and drains
- Remove debris—such as leaves, twigs and trash—from ditches
- Turn over, cover tightly, or remove equipment such as tarps, buckets,
barrels, dumpsters, cans, wheelbarrows, tires and other containers that
accumulate water. When this is not practical, drill drain holes in the
- Where appropriate, offer to help your elderly or disabled neighbors.
Mosquitoes disregard fences.
- Report areas of high mosquito activity to the Department of Public
Eliminating standing water in backyards and around houses will also
reduce the likelihood of getting bitten by an infected mosquito. Also
this summer, it is important for residents to be extra vigilant in
reporting areas with high mosquito activity.
Within the City, San Francisco’s Department of Public Works,
Environment, the Public Utilities Commission, and Recreation & Parks are
joining with DPH in this “Fight the Bite” campaign to educate residents
about preventing West Nile Virus. For information visit