TOPEKA, Kan. (AP) — Health officials say Kansas has not had any confirmed cases of the Zika virus.

However, two travel-related cases of Zika virus have been reported in Nebraska.

The Zika virus, which is generally so mild that it only causes symptoms in about one out of five cases, raised concerns recently when doctors in Brazil started to notice a possible link between the virus — spread by a particular mosquito — and the birth defect microcephaly.

Symptoms of the virus include rash and fever.

The Kansas Department of Health and Environment said Friday in a release that it recommends that pregnant women consider postponing travel to areas where Zika virus transmission is ongoing.

So far, the only recent case transmitted in the U.S. is believed to have occurred in Texas through sex.