Medical staff perform an extraction of a Covid-19 sample at the Mediterranean institute of infection of La Timone hospital in Marseille, southern France.

A medical worker prepares samples at the Mediterranean institute of infection of La Timone hospital in Marseille, Southern France.. One by one, more and more countries are reportin...

Matt Dunn, a researcher for the Center for Vaccine Research at the University of Pittsburgh, holds dead samples of the coronavirus (COVID-19), at the Biomedical Science Tower 3 in ...