A patient in Denmark has tested positive for the Zika virus.
It's been linked to brain damage in thousands of babies in Brazil - and health officials have been warning that it's set to spread across South America.
Danish doctors say the patient has recently returned from travelling in the region.
The Zika virus doesn't cause many serious symptoms in most people - mostly a rash, fever and runny eyes. Deaths are very rare.
The main concern is if a pregnant woman gets the virus as it is linked to a birth defect called microcephaly. This causes a smaller than average brain and head in babies.
The virus is caused by a mosquito bite.
So far it's been found in 21 countries including El Salvador, Guatemala, Honduras and Panama. It was first detected in Brazil in May 2015.
No treatment or vaccine is available.
