"You may have a second peak within your first wave, and then you may have a second wave, it's not either/or," he noted.

According to Ryan, now that many countries potentially are in a situation where increased testing resulted in the number of cases rising, it's difficult to determine whether an increased number of cases is due to more testing or more spread of the disease.

"It's very important at that time to look at things like hospitalizations and deaths. If you start to see hospitalizations going up, that's not because of testing; if you start to see the number of people dying going up unexpectedly, that's not because of testing," he emphasized.

"What we really want to see is that the ability to use data, to use investigation, to use testing, to use physical and social measures in an agile, adaptive, sensitive way where you're doing the absolute minimum you need to do to suppress the infection or the maximum you need to do with the minimum disruption of society," he added.

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