Nurith Aizenman

Three years ago, NPR accompanied disease ecologist Kevin Olival on a field trip to Malaysian Borneo.

The number of people who are infected with the new coronavirus that is spreading from China is dwarfed by those affected by a far more common respiratory illness: seasonal flu.

Every year there are as many as 5 million severe flu cases worldwide and hundreds of thousands of deaths. By contrast, so far there have been about 20,000 (and rising) cases of coronavirus, most of them mild.