Virologists often take a functional definition of how much mutation is required ...

		danieltillett on April 29, 2020 \| parent \| context \| favorite \| on: What other coronaviruses tell us about SARS-CoV-2 Virologists often take a functional definition of how much mutation is required to make a new virus. If two different strains have changed so much that immunity to one strain doesn’t provide protection from the other strain then they are considered different viruses.