All states need to provide public information, particularly to pregnant women, and to assess returning travelers who may have contracted Zika virus infection. States with known Aedes aegypti mosquitoes need to intensively monitor for cases in returning travelers and prepare to find and stop clusters of Zika before they become widespread. States with Aedes albopictus mosquitos need to presume transmission is possible and be ready to prevent, detect, and respond to cases and possible clusters of Zika infection. The objective of a phased,<unk><unk>  response using Zika virus surveillance data is to implement public health interventions appropriate to the level of Zika virus<unk>  in a community, county, or state.
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