Zika Transmission from Woman to Man Reported for First Time

Officials first said months ago that they believed men who are infected with Zika or who recently recovered from an infection can transmit the virus through unprotected sex.

But researchers have linked the infection in pregnant women to serious birth defects, such as microcephaly.

She fell ill the next day, and a doctor's visit and subsequent laboratory tests confirmed she'd been infected with the Zika virus.

The Centers for Disease Control and Prevention has documented the first case of female-to-male sexually transmitted Zika in the US.

Until now, scientists knew that a man with Zika could pass it to a female or male partner during unprotected sex, regardless of whether the man shows symptoms.

Although Zika is primarily spread through mosquito bites, the CDC said it has detected viral RNA in semen 62 days after an individual's onset of illness was reported.

Health officials from NY reported the case in the CDC's weekly report on death and disease.

Nationwide, more than 1,300 people in all 50 states and Washington have been diagnosed with Zika.

However, "if our concern about Zika is the risk of birth defects, female-to-male transmission isn't going to increase that risk, unless the male has multiple partners", Siegel explained. The man's urine and serum specimens showed Zika virus RNA in urine but not in serum; Zika virus IgM antibodies were not detectable. The couple is now included in the 309 cases of Zika reported in New York City, all associated with travel. The next day, she felt symptoms including fever, rash and muscle pain.

"This case represents the first reported occurrence of female-to-male sexual transmission of Zika virus", the report concluded. To this point all other recorded cases of sexual transmissions of the mosquito-borne virus have been from men to their sexual partners.

It was already known that the Zika virus could be passed from a man to a woman via sexual intercourse.

The state Department of Health on Thursday began distribution of the kits, which include insect repellents, water tablets for killing mosquito larva, and condoms to prevent sexual transmission of the virus, health officials said in a news release. That same day, the woman also started her menstrual period. However, in USA territories, there have been 2,916 cases of Zika, with almost all of those have been locally acquired. The female patient had traveled to an area affected by ongoing Zika transmission and had sought medical treatment for symptoms before having sex with her partner.

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