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Health officials grappling with the Zika virus in Florida face a mystery: a pregnant woman who set off the Zika scare is not connected to a one square-mile area in where officials have identified the virus.

WSJ's Betsy McKay explains on Lunch Break with Tanya Rivero and updates efforts to contain the mosquito-borne illness.

 [WSJ Video: 4:29]

See More (Wall Street Journal)