Two more prominent sports figures have pulled out of the Olympics in Rio de Janeiro due to Zika concerns, this time reigning doubles tennis champions Bob and Mike Bryan.
With Rio 2016 set to get underway in August, the Bryan brothers announced their withdrawal on Saturday, taking to Facebook to share the news.
"After countless hours of deliberation, Mike and I have decided to forego the Rio Olympics," the Bryan brothers said in a statement.
"Though we'd love to compete again, as husbands and fathers, our family's health is now our top priority.
"Representing Team USA is one of our proudest tennis moments to date and winning gold in 2012 will always remain the pinnacle of our career. ...We wish every athlete luck in their quest for Olympic glory and hope the Rio Games are a positive experience for everyone involved.
"Our wives were involved, our parents were involved and it's the toughest decision we've probably ever made, but ultimately we feel better about it."
It is a big hit for USA in the tennis department, since the brothers are the most decorated men's tennis duo of all time.
American men's singles players John Isner and Sam Querrey also withdrew from the Olympics to focus on the US Open.
Zika, a virus carried by mosquitos, is known to birth defects when babies are born to women positive for the virus. Men can also sexually transmit the virus to their partners.