SARS-CoV-2, the virus that causes Covid-19. It’s just too small. But months of research has enabled scientists to identify and rank the most likely ways (such as spending more than 15 minutes close to an infected person) as well as highly unlikely ones (such as handling frozen fish at the supermarket).
Understanding these risks is crucial for figuring out how best to stem the pandemic’s spread.In a nutshellPerson-to-person close contact is widely considered the dominant mode of infection, because those infected expel droplets carrying virus particles when they speak, sing or just breathe normally.