Brazil issues Olympics warning as WHO declares Zika emergency

Brazil has warned pregnant women to stay away from the Summer Olympics after the World Health Organization declared an international emergency over the Zika virus, blamed for causing a surge in brain-damaged babies.

The UN health body said that a rise in cases of microcephaly - in which babies are born with an abnormally small head - was likely caused by the mosquito-borne virus, and declared the situation a "public health emergency of international concern."

That prompted an unprecedented warning from Brazil, just six months from the Olympics opening ceremony on August 5 in Rio de Janeiro.

"The risk, which I would say is serious, is for pregnant women. It is clearly not advisable for you (to travel to the Games) because you don`t want to take that risk," said President Dilma Rousseff`s chief of staff, Jaques Wagner.

Wagner sought to downplay fears for Olympic athletes and fans who are not expectant mothers.

"I understand that no one needs to be afraid if you are not pregnant," he said.

Brazilian President Dilma Rousseff gestures during a ministerial meeting to discuss new measures to International Olympic Committee President Thomas Bach said the WHO`s declaration raises more awareness and provides "more resources to fight the virus."

Olympic Committee officials "are in close contact" with the WHO and Olympic committees "around the world," said Bach, speaking in Los Angeles.

"There is no travel ban," he said.

The Games "will also take place in winter time in Brazil and this is not the preferred breeding time for mosquitoes."

These factors "make us very confident that at the time of the Olympic Games there will be good conditions for athletes and spectators."

Some health officials also blame the Zika virus for causing Guillain-Barre syndrome, a rare disorder in which the immune system attacks the nervous system, causing weakness and sometimes paralysis.

That syndrome directly affects Zika patients themselves. Most recover, but the syndrome is sometimes deadly.