A rare case of the Zika virus being transmitted through sex has been reported in the US.
The Centers for Disease Control (CDC) has confirmed a patient infected in Dallas, Texas, is likely to have been infected by sexual contact this year.
The patient, the county says, “was infected with the virus after having sexual contact with an ill individual who returned from a country where Zika virus is present.”
The person had not travelled to infected areas but their partner had returned from Venezuela.
Previously, 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.