Experts: Herd Immunity Outside Us Slows Zika In Florida

Herd immunity, when enough people in an area are infected with a virus and develop resistance to it, likely has contributed to Zika's decline outside the continental United States, Dr. Henry Walke, the U.S. Centers for Disease Control and Prevention's incident manager for Zika response, said in a Miami Herald report . By the end of 2016, state health officials had confirmed 1,456 Zika infections in Florida, including 285 cases spread by mosquitoes in Miami and Miami Beach. The infections caused the CDC to issue an unprecedented domestic travel advisory warning pregnant women to avoid Miami-Dade County because the virus can cause severe birth defects. Florida health officials have reported 384 pregnant women who tested positive for Zika since January 2016, with nine delivering children with Zika-related birth defects. Frequent rainfall, which benefits breeding mosquitoes, and the fact that many people infected with Zika don't feel any symptoms — such as fever, joint pain, red eyes or a rash — can fuel an outbreak in spite of increased mosquito-control efforts, said Bill Petrie, the county's new mosquito control director.

 

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