Zika Virus

Zika Virus Infections in San Bernardino County

LAST UPDATED: June 27, 2018

Travel Associated Locally Acquired
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Zika virus is transmitted to people primarily through the bite of infected Aedes aegypti mosquitoes (yellow fever mosquitoes) or Aedes albopictus mosquitoes (Asian tiger mosquitoes). These mosquitoes are not native to California. However, since 2011 they have been detected in several California counties. An Aedes mosquito can only transmit Zika virus after it bites a person who has this virus in their blood. To date there has been no local mosquito-borne transmission of Zika virus in California. Thus far in California, Zika virus infections have been documented only in people who were infected while traveling to areas with ongoing Zika transmission, through sexual contact with an infected traveler, or through maternal-fetal transmission during pregnancy. Zika virus during pregnancy can cause microcephaly and other severe brain defects in infants. Additionally, there is an association between Zika and Guillain-Barré Syndrome, a disease affecting the nervous system.

  • Zika is spread primarily through the bite of an infected Aedes aegypti or Aedes albopictus species mosquito.
  • Zika can be passed from a pregnant woman to her fetus, which can cause severe birth defects.
  • Other modes of transmission:
    • Human to mosquito
    • Contact to infected blood
    • Sexual contact
  • There is no vaccine to prevent or medicine to treat Zika.

Women who are pregnant or are planning to become pregnant should not travel to areas with a CDC Zika travel notice.

Men who reside in or have traveled to an area with active Zika should use condoms or abstain from sex to avoid sexual transmission for at least 6 months.

If travel cannot be avoided, avoid insect bites using DEET insect repellent, light-colored long sleeves, and mosquito nets. For more information on how to protect yourself from Zika while traveling, check out the Zika Travel Packing List.

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*Mosquitoes that can spread Zika usually live in places below 6,500 feet. The chances of getting Zika from mosquitoes living above that altitude are very low.

Note: Recommendations for travel within the continental United States may differ from those for international travel. These recommendations are usually made at the level of the city or county, so you may need to zoom in on the map to see them.

Protect Your Community

  • Zika can be introduced to local mosquito populations.
  • Eliminate mosquito breeding sites, like containers with standing water to ensure no local transmission occurs.
  • Mosquito larvae can develop in a bottle cap full of water. Even without water, the eggs can survive for months.

Protect yourself from mosquito bites

Yellow fever mosquito
Asian tiger mosquito

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