Scientists are racing to predict where the next pandemic will start

In a race to prevent future deadly pandemics, scientists are trying to pinpoint the animals and regions where the next Ebola or Zika might arise — before the viruses start harming people. But some experts argue that it makes more sense to look for new viruses in humans, not other animals. In fact, the next emerging infectious disease is probably already out there, making people sick.

Animals host a massive number of viruses, and sometimes these viruses make the jump to humans. (These viruses are called zoonoses.) This happens pretty rarely, but when it does, it can wreak havoc: most pandemics in recent memory like HIV, pandemic influenza, and Zika were caused by viruses that started out in animals....

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