The United States won most medals at the last Olympics in London in 2012, so any disruption to its presence would be important for the Rio games.
Global health authorities suspect the mosquito-borne Zika virus has caused a spike in Brazil of microcephaly, a birth defect marked by an abnormally small head. As a result, the World Health Organization declared an international health emergency Feb. 1, and the U.S. Centers for Disease Control and Prevention (CDC) is advising pregnant women or those considering becoming pregnant to avoid travel to places with Zika outbreaks.
The USOC's Alan Ashley, its chief of sport performance, and other USOC officials, briefed the leaders of the federations.
Ashley did not respond to email or phone calls requesting comment.
USOC spokesman Mark Jones confirmed by email that Ashley had "briefed federation leaders on the CDC's recommendations and we will continue to ensure that athletes and officials affiliated with Team USA receive any updates from the CDC."
The USOC has not issued its own set of recommendations for athletes and staff beyond what the CDC and WHO have issued.
Jones declined to comment further or respond to specific questions from Reuters before publication.
In a statement on Monday, another USOC spokesman Patrick Sandusky said media reports that the USOC has advised U.S. athletes to reconsider competing in Rio due to the Zika virus were inaccurate. It was unclear what media reports he was referring to and he couldn't be immediately reached for comment.
"Team USA looks forward to the Games and we did not, would not and will not prevent athletes from competing for their country should they qualify," Sandusky said.
Recalling the conference call, Anthony, a former Olympian, said: "One of the things that they immediately said was, especially for women that may be pregnant or even thinking of getting pregnant, that whether you are scheduled to go to Rio or no, that you shouldn't go."
"And no one should go if they feel at all as though that that threat could impact them," said Anthony, who praised the USOC's handling of the outbreak so far.
Zika outbreaks have been reported in 33 countries, most of them in the Americas. Symptoms of infection often are mild or imperceptible. But the outbreak in Brazil that began last year has been accompanied by more than 4,000 cases of suspected microcephaly; investigators have confirmed more than 400. The link to Zika is unproven but strongly suspected.
In El Salvador, which is experiencing outbreaks of the virus, women are being advised to put off pregnancy until 2018.
Will Connell, Director of Sport at the U.S. Equestrian Federation, said the USOC was leaving the decision up to individual athletes and staff members.
"They said no one who has reasons to be concerned should feel obliged to go," Connell said. "If an athlete feels that way, of course they may decide not to go."