Researchers at the South Korean centre for disease control and prevention (CDC) now say it is impossible for people to be infected with COVID-19 twice.
According to South Korean scientists, the reported cases of coronavirus patients relapsing after overcoming the disease were actually due to testing failures.
Genetic analyses of the virus have not found any substantial changes which would effectively disguise it from the immune system. This was concluded after concerns that the virus could be mutating so quickly that people were not necessarily immune to catching it again.
This is after a total of 277 patients in the country were believed to have fallen ill for a second time, as had patients in China and Japan.
There have been more than 10,000 confirmed coronavirus cases in South Korea, with 245 deaths – a 2.3% fatality rate, which is lower than the 3.4% average as stated by the World Health Organisation.