Singapore confirms Zika spread; U.S. and other countries issue travel warnings
Reuters - 08/30/2016
he outbreak in the Americas was caused by a Zika strain from Asia, possibly carried to Brazil through travel to a sporting event. Many experts believe once infected, Zika produces lifelong immunity.
“Unfortunately, it is not clear the level of immunity that is currently in Asia,” said Alessandro Vespignani of Northeastern University in Boston.