A pregnant woman is among the seven people identified as being infected with the Zika virus in Spain after visiting affected countries.

The country's health ministry said the woman travelled to Colombia, was presumably infected during the trip and is in her second trimester of pregnancy.

She is under medical supervision in the north-eastern region of Catalonia.

The ministry says the number of cases diagnosed so far are within expectations and do not pose a risk for the virus to be spread in Spain.

International health authorities are trying to determine if the mosquito-borne illness is linked to birth defects in Brazil.