"There’s also dispersion, less familiar, which is the variation in actual (not average) reproduction number from one infected person to another. If some people cause few secondary infections and some cause many, the dispersion is high. (The dispersion of Covid-19 is high.) Why? Although part of the answer may be that some individuals simply shed more virus, or wash their hands less, or refuse to wear masks or cough more, another contributor to superspreading, Christakis explains, is that certain people have many more social contacts than the average. He calls those “popular people,” and notes that they “are more likely to become infected themselves as well as more likely to infect numerous others.”"
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