A critical window to stop hantavirus is opening. Not all countries are managing exposed travelers the same way

the first signs of infection. US officials have said they don’t recommend testing until a person shows symptoms, however.

Bogoch thinks that approach may prove inadequate. His study found that people may shed virus several days before symptoms appear.

“Relying on symptoms alone, you’re going to miss people,” he said. His study found that those infected continue reading …