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'The results highlight how widely and unpredictably disease severity and contagiousness vary between people. “And it’s that variability among humans that has made this virus so difficult to control,” says infectious-disease doctor Monica Gandhi at the University of California, San Francisco, who was not involved in the work. The study, published on 9 June in Lancet Microbe, also suggests that human physiology, not the virus, is to blame for some of the inconsistency of COVID-19'
