Bangladesh on Tuesday confirmed its first case of the Zika virus. It was found in an old blood sample from a 67-year-old man from Chittagong, who the Health Ministry said had never travelled out of the country. His family tested negative for the mosquito-borne virus that is believed to cause microcephaly in babies, Reuters reported. Meanwhile, South Korea also confirmed its first case of Zika in a man who recently returned from Brazil. The 43-year-old, who was diagnosed on Tuesday, has been quarantined.

The World Health Organization declared Zika an international health emergency on February 1, fearing the possible link the virus has with the increasing number of cases of microcephaly. Characterised by an abnormally small head in babies, microcephaly is a birth defect that can cause developmental issues. The virus, which has its epicentre at Brazil, has spread through most of the Americas.