A study by Imperial college London, has found that people who have had, and recovered from the common cold, are more likely to not get infected with Covid than those who have not. That seems plausible since the SARS-CoV-2 Wuhan virus and the common cold are both coronaviruses. Still, as interesting as this result is, I wonder where the population group serving as a control, those not having had a common cold, came from, since I have never met anyone who had not had a common cold, except for very young babies.