united states topped 1800 this week, mostly from travel to foreign countries. but in a miami neighborhood, health officials say local mosquitoes have now infected at least 16 people with the virus, which causes severe birth defects. pregnant women are advised to stay away from florida s so-called zika zone. as marlie hall reports, the outbreaks that sent a chill through florida s tourism industry. reporter: insecticide rained down on mime s zika zone. the spraying continued this morning by air and by land. my one job is to protect this baby. i can t get bit by a mosquito. reporter: lisa isaza is 36 weeks pregnant. she and other expectant mothers, like leah lacero, are on edge. the most fearful thing is i don t want to have a child who ends up with some of the severe cerebral defects that have been talked about, including microcephaly. reporter: another concern tourism. florida s biggest industry. visitors spent about $89 billion here last year. governor rick scott