PRI's The World Published by PRI's The World How worried should Olympic visitors be about Zika? Listen Queue Download this audio Want to embed this player? Use the code below. More info. <iframe frameborder="0" scrolling="no" height="130" width="100%" src="https://www.wnyc.org/widgets/ondemand_player/wnyc/#file=/audio/json/651157/&share=1"></iframe> Share on Facebook Share on Twitter Email a Friend Zika transmission is down during Brazil’s winter, but US health officials say it's still unsafe for pregnant women to visit.