U.S. Centers for Disease Control and Prevention(CDC) is probing fourteen cases of Zika Virus, which are suspected to be transmitted sexually.

The new cases involve men who travelled to the Zika-affected countries. They are suspected of infecting their female partners who had not travelled to any of those countries, according to Yahoo News.

CDC on Tuesday confirmed two cases of women infected from the virus. Other eight cases are under investigation. Male partners are yet to be tested in the lab.

“In two of the new suspected sexual transmission events, Zika virus infection has been confirmed in women whose only known risk factor was sexual contact with an ill male partner who had recently traveled to an area with local Zika virus transmission,” CDC said in a report by Health.

“Testing for the male partners is still pending.”

On Monday, a 16-member team of epidemiologists from CDC kicked off it research-operation in Brazil to determine the link between Zika and birth defects.

CDC made eights teams of Brazilian-American researchers. They were set to search for 100 mothers with newborn babies affected by microcephaly in different regions.

The research is in progress. It includes testing of blood samples of mothers and babies for detailed understanding of the link. The same tests apply to the women who gave birth to healthy babies in the same environment.

On 5th February, US reported a case of Zika virus transmitted not from the mosquito bite, but through sexual intercourse. A man from Dallas did not travel to any of the affected countries. Although, his partner was reported to have travelled to Venezuela.

Zika virus is suspected to have links with a neurological disorder- Microcephaly, which causes health anomalies like small head-shape and weak brain. It has spread across Latin America and the Carribean. Until Now, US has reported 82 cases of Zika infection, all related to the people travelled the affected regions.