The Zika virus is quickly expanding its reaches. Now, a rare case of the Zika virus has reached the United States. However, the transmission didn’t come in the form of a mosquito bite but rather through sexual intercourse.

BBC reports that a Dallas man may have been infected with the Zika virus through sexual contact. The man had not travelled to regions that are affected by the virus. However, his partner had been to Venezuela, a country listed where the virus is widespread as of late.

The Zika virus is known to be carried by mosquitoes, and it has been linked to a number of newborn cases with microcephaly or undeveloped brains. Now, it is continuously expanding its reach to the West, and the World Health Organization has already declared that the virus’ effects warrant a global emergency.

The Centers for Disease Control and Prevention (CDC) has updated its Zika virus guidance for women who are pregnant. If their spouses happen to travel to parts of a country where the Zika virus is widely present, then sexual protection or abstinence is strongly advised.

The guidance indicates that if a male sexual partner has been in places where the virus is present, the spouse must abstain from sex. They also have to use condoms correctly every time they engage in vaginal, anal, and oral sex when the spouse or partner is pregnant.

CDC confirmed to CNN that the test results show the Zika virus is present in the blood of a “nontraveler in the continental United States.” Furthermore, the CDC notes that it does not pose any risk to a developing fetus.

Prior to this, there have been several recorded cases that linked the Zika virus to intercourse. First was during the 2013 Zika outbreak in French Polynesia, and second was in 2008 when microbiologist Brian Foy contracted the virus after travelling to Senegal. His wife contracted it a few days after.