British health authorities have alerted the UN of a new respiratory virus in a severely ill patient from Qatar.

The man was sickened by a coronavirus, which causes most common colds but also causes Sars, or severe acute respiratory syndrome. In 2003, Sars killed hundreds of people, mostly in Asia, in a short-lived outbreak.

Britain’s Health Protection Agency said in a statement late on Sunday that the 49-year-old patient had recently travelled to Saudi Arabia.