RIO DE JANEIRO, BRAZIL - Several countries have now brought the coronavirus epidemic under control through tougher or gentler measures. This has allowed them to venture a return to the much longed-for normality with initial relaxation.

But it is precisely in countries like South Korea, where everything seemed to be under control, that new outbreaks are now occurring. The warnings of a second wave were thus well-founded.

How could the new outbreaks have developed? Are the so-called superspreaders - a few virus carriers that infect many other people - the driving force? Or are certain activities particularly contagious? And how . . .

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