Before this case, there have been only two documented cases linking Zika to sex. During the 2013 Zika outbreak in French Polynesia, semen and urine samples from a 44-year-old Tahitian man tested positive for Zika even when blood samples did not. Five years before that, in 2008, a Colorado microbiologist named Brian Foy contracted Zika after travel to Senegal; his wife came down with the disease a few days later even though she had not left northern Colorado and was not exposed to any mosquitoes carrying the virus.
In addition, the CDC said there have been documented cases of virus transmission during labor, blood transfusion and laboratory exposure. While Zika has been found in breast milk, it's not yet confirmed it can be passed to a baby through nursing.
