Covid-19 cases are climbing – in Germany and beyond. The attempt to return to normalcy has thwarted social distancing measures. Authorities fear holidaymakers will bring the virus with them. So there are now tests at airports to help curb that risk. No one wants a second wave of the coronavirus or another wave of pandemic lockdowns. But no one can rule them out if the number of cases continues to rise. So what is a second wave? And what would one look like?
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