A precise understanding of the spread of the epidemic is vital to isolating and treating those infected as well as developing a profile of those who can build up immunity to it.
Despite extensive study by doctors and scientists across the world since the new coronavirus first appeared in China three months ago, much about the scourge is still unclear.
During the peak of the epidemic in China, he and a team from the University of Nanchang compared those with mild and severe forms of the illness. Research on the measles virus has shown that the gravity of the illness is related to the level of exposure. Experts do not yet know whether this is the same for Covid-19.Coronavirus is known to spread through physical contact and through droplets dispersed when an infected person coughs or sneezes. But can it also hang in the air like the virus that causes the seasonal flu?
Apart from the few countries that have used aggressive testing, like South Korea and Germany, global figures on the number of people carrying the virus are sketchy. Respiratory viruses like the flu are more stable in cold and dry weather, which is why they spread more rapidly in winter.
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