But the research team warn that their findings do not show that the virus can’t be passed on by asymptomatic carriers.
Rather, strict non-pharmaceutical interventions such as mask-wearing, hand washing, social distancing and lockdown have helped reduce the virulence of Covid-19.
However, the research team say that it is important to emphasise that the results of this study should be correctly interpreted.
there is plenty of evidence elsewhere showing that people infected with Covid-19 may be temporarily asymptomatic and infectious before going on to develop symptoms.
“It’s also very important to say that these asymptomatic cases were identified shortly after the relaxation of a very stringent lockdown in Wuhan that lasted more than 70 days. By then, the epidemic in Wuhan had been effectively brought under control.
“So, it would be problematic to apply the results of our research to countries where Covid-19 outbreaks have not been successfully brought under control.
“Actually, the existence of asymptomatic cases remains a concern even in Wuhan. It is too early to be complacent, because of the existence of asymptomatic positive cases and high level of susceptibility in residents in Wuhan.
“Public health measures for the prevention and control of Covid-19 epidemic, including wearing masks, keeping safe social distancing in Wuhan should be sustained. And vulnerable populations with weakened immunity or co-morbidities, or both, should continue to be appropriately shielded.”
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