At least three people have been found to be carrying the Zika virus in Yorkshire.

Calderdale and Huddersfield NHS Foundation Trust said the patients were believed to have contracted the virus overseas.

Zika has been declared a global public health emergency by the World Health Organisation (WHO).

The virus, which is mainly spread by the Aedes aegypt species of mosquito, typically causes only mild symptoms in adults but can cause a major birth defect called microcephaly in the babies of pregnant women who are infected.

Babies with microcephaly are typically born with abnormally small skulls – which can cause the child to suffer convulsions and develop learning difficulties.

Dr Gavin Boyd, of the Calderdale and Huddersfield trust, told The Independent: “There is extremely low risk of contracting Zika virus in the UK as the mosquito that transmits the virus is not present in the UK.

“A small number of cases of sexual transmission globally have been reported but the risk is very very small.

“There is no specific treatment and it wears off naturally after two to seven days. After a diagnosis, patients are cared for by their GPs.”

The Zika virus - in pictures Show all 5 1 /5 The Zika virus - in pictures The Zika virus - in pictures A three-month-old, who has microcephaly, in Recife, Brazil. A rise in microcephaly cases is thought to have been caused by the spread of the Zika virus in affected countries Getty Images The Zika virus - in pictures A mother holds her baby who has microcephaly Getty Images The Zika virus - in pictures A five-month-old baby, who has microcephaly, in Recife, Brazil Getty Images The Zika virus - in pictures A pediatric infectologist examines a two-month-old baby, who has microcephaly, in Recife, Brazil Getty Images The Zika virus - in pictures A baby affected with microcephaly

According to Public Health England, there have been 53 cases of Zika diagnosed in the UK since 2015.

The new cases come as Spain recorded its first instance of a baby being born with the condition to a woman previously exposed to the virus.

The unnamed mother was diagnosed with Zika in May after visiting Colombia but decided to keep her baby, who was born in Barcelona on Monday.