WORLD: They made a very astonishing discovery in the laboratory back in April: 40 percent of the test persons they had tested who had never come into contact with the corona virus had cells in their blood that the virus was able to fight off. What exactly does that mean?
Leif Sander: The finding astonished us at first. But apparently a previous infection with related corona viruses activates the immune system so that it also reacts to Sars-CoV-2.
WORLD: What does this activation look like?
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