What Is the Zika Virus?

As many as 1.5 million Brazilians may have been infected with the mosquito-borne Zika virus and now the U.S. and other countries are also reporting news cases. But what is the Zika virus? And why does it pose a threat to pregnant women? Dipti Kapadia explains. Photo: Getty Images Subscribe to the WSJ channel here: More from the Wall Street Journal: Visit : Follow WSJ on Facebook: Follow WSJ on Google :