A senior World Health Organisation official has urged national authorities to make a priority of understanding the long-term consequences of coronavirus infections as some people show worrying symptoms months later.

“It's a clear priority for WHO, and of the utmost importance. It should be for every health authority,” Hans Kluge, regional director for WHO Europe, told a press conference, according to AFP.

“The burden is real and it is significant. About one in 10 Covid-19 sufferers remain unwell after 12 weeks, and many for much longer,” Kluge said.