Zika Is Expected To Infect 1 In 5 Puerto Ricans, Raising Threat To Rest Of U.S.

SAN JUAN, Puerto Rico — Zika has landed forcefully in America, in one of its poorest and most vulnerable corners, a debt-ridden territory lacking a functioning health-care system, window screens and even a spray that works against the mosquitoes spreading the virus in homes, workplaces, schools and parks.

There are 117 confirmed cases of the virus in Puerto Rico, four times the number at the end of January. The island territory, which has a population of 3.5 million people, is “by far the most affected area” in the United States, Tom Frieden, director of the Centers for Disease Control and Prevention (CDC), said Friday. The number will almost certainly rise sharply in coming weeks, making it ever more likely that the virus will spread to the continental United States.