Chinese health authorities began on Wednesday reporting on asymptomatic cases of the coronavirus as part of an effort to allay public fears that people could be spreading the virus without knowing they are infected with it.
China, where the coronavirus emerged late last year, has managed to bring its outbreak under control and is easing travel restrictions in virus hot spots.
But there are concerns that the end of lockdowns will see thousands of infectious people move back into daily life without knowing they carry the virus, because they have no symptoms and so have not been tested.