Heather Hiscox is in Rio de Janeiro, and shows how Brazils government is taking action »»» Subscribe to CBC News to watch more videos: .<br />The US President is urging the rapid development of a vaccine for the Zika virus, as it continues to spread across the Americas. Brazil is worst affected.<br />The mosquitoes spreading the Zika virus are causing an increasing health concern across regions of South America. Brazils government says it will deploy .<br />Brazil is advising pregnant women to avoid this summers Olympic games over the risk of birth defects from the Zika virus. The World Health Organization took .
