Virologists have wondered whether common cold coronavirus also got their start in a pandemic, before settling in as routine viruses.
Gurmeet Singh , Assistant Professor Medecine. Pandemic may have widely spread in Africa but mortality is low. The reason could be younger age of the population as compared to Europe , USA and previous exposure to common cold coronavirus. Investigators are not sure as yet.
Using random variables for reproductive numbers more realistically predicts the risky tail events , the rarer but more significant super spreader events.