In a request last month, US Senator Jeanne Shaheen asked WHO's Director-General Dr. Margaret Chan to evaluate whether the Rio games should be delayed or postponed.
Chan said in a letter released by Shaheen today that WHO has sent senior scientists to Brazil four times to assess the risk of Zika to the approximately 500,000 athletes and visitors expected to attend the Aug. 5-21 Olympics.
Chan said she "deeply appreciate(d)" the concerns raised by Shaheen in her original letter to WHO last month, which cited a commentary by Canadian professor Amir Attaran. He argued that holding the Olympics as planned would result in the avoidable birth of brain-damaged babies.
Last month, Attaran and more than 200 other experts signed an open letter asking WHO to convene an independent group to consider if the games should be delayed or moved "in the name of public health." WHO rejected such calls and said "cancelling or changing the location of the 2016 Olympics (would) not significantly alter the international spread of Zika."
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WHO declared the Zika epidemic to be a global emergency in February and in its latest assessment this week, said it "does not see an overall decline in the outbreak."
WHO has already advised pregnant women not to go to Rio and says other travelers should avoid poor and overcrowded parts of the city. The UN agency also predicted the Zika risk in August would drop since it will be the south American winter and there should be fewer mosquitoes to transmit the virus.
In recent years, WHO established a group to help cities not only with health advice, but to potentially help them bid for major events like the Olympics.