There is currently no evidence to support the belief that people who have recovered from coronavirus then have immunity, the World Health Organisation has said.

Senior WHO epidemiologists warned despite the hopes governments across the world have piled on antibody tests, there is no proof those who have been infected cannot be infected again.

The British Government has bought 3.5 million serology tests, which measure levels of antibodies in blood plasma, even though they are not definitive of growing levels of herd immunity.

Many tests being developed are pin-prick blood tests similar to widely used instant HIV tests and measure for raised levels of the antibodies the body uses to fight the virus.

Speaking at a press conference in Geneva, Dr Maria van Kerkhove said: "There are a lot of countries that are suggesting using rapid diagnostic serological tests to be able to capture what they think will be a measure of immunity.