zika virus
Local mosquitoes are believed to have infected 10 more people in a small area of Florida. CDC/Cynthia Goldsmith via Wikimedia Commons

Today, the CDC reported the case of a woman sexually transmitting the zika virus to her male partner, the first such case of zika being transmitted in this way.

The report came out of New York where a woman in her 20s, who had recently returned from a zika-stricken area, had unprotected sex with her male partner. He was subsequently diagnosed with the infection.

While reports of the zika virus spreading through sexual means has been reported in the past, those have been exclusively from male-to-female partners. Previously, research and anecdotal evidence had made it clear that zika could be sexually transmitted from a male to a woman, given the evidence that the virus remains in the semem for weeks after a person is infected. But as Stat points out, the idea of it being transmitted from female-to-male is not entirely surprising. Research done on primates has shown that zika has the potential to stay in vaginal fluid for up to seven days.

Regardless, this new transmission method will likely cause the CDC to update its current guidelines on preventing the spread of the virus. Right now it recommends that pregnant women avoid traveling to areas that have high rates of zika infections.

While the goal is to prevent transmission and stop the outbreak, the CDC, as well as the WHO, remain confident that the 2016 Olympics games, which will take place in Rio later this summer, will not have a significant effect on further spreading the virus.