A British Airways cabin crew member tested positive for Monkeypox, during a layover in Singapore. It is the Asian city-state’s first known case of the disease, Singapore’s Ministry of Health said.

The 42-year-old British man tested positive for Monkeypox on 20 June and is in an isolation ward at Singapore’s National Centre for Infectious Diseases.

He is in a ’stable condition.’

Thirteen close contacts have been placed under a 21-day quarantine, including BA work colleagues.

The Ministry of Health said there is minimal risk to passengers as transmission is only through close physical contact.

British Airways had to cancel its Singapore to London flight on Tuesday night. It is now scheduled to depart 24 hours later with a new crew.

The UK Health Security Agency said he Imvanex smallpox vaccine is very effective against the Monkeypox virus.