The United States Olympic Committee told US sports federations that athletes and staff concerned for their health over the Zika virus should consider not going to the Rio Olympic Games in August.

The message was delivered in a conference call involving USOC officials and leaders of US sport federations in late January, according to two people who participated in the call.

Federations were told that no one should go to Brazil “if they don’t feel comfortable going. Bottom line,” said Donald Anthony, president and board chairman of USA Fencing.

The USOC’s briefing to sport federations is the latest sign that Olympics officials are taking the Zika threat to the games in Rio de Janeiro seriously, and acknowledging that at least some athletes and support staff could face a tough decision over whether to attend.

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 Organisation declared an international health emergency on February 1.

The USOC’s Alan Ashley, its chief of sport performance, and other USOC officials, briefed the leaders of the federations.

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 (US Centers for Dsease Control and Prevention).”

The USOC has not issued its own set of recommendations for athletes and staff beyond what the CDC and WHO have issued.

Recalling the conference call, Anthony, a former Olympian, said: “One of the things that they 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 threat could impact them,” added Anthony, who praised the USOC’s handling of the outbreak so far.

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