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William Hanage

Associate Professor of Epidemiology, Harvard T. H. Chan School of Public Health

Expertise: Epidemiology, Infectious diseases

Misleading Wall Street Journal opinion piece makes the unsubstantiated claim that the U.S. will have herd immunity by April 2021

“The article’s claim that the U.S. is near herd immunity rests on two numbers: 1) the detection of infections by testing (claimed to be 10 – 25 percent) and 2) the infection fatality rate (claimed to be 0.23 percent). Using the same number of deaths as the author indicates that 0.15%/0.6% = 25% of the U.S. population has been infected, rather than two-thirds as the author claims. Thus, the author’s argument that 55 – 66 percent of the U.S. population has already been infected and has immunity is not supported by available data.”

Telegraph article describing the hypothesis that face masks can variolate a population receives mixed reviews on its scientific accuracy

“The Telegraph headline is obviously misleading but the subheading is accurate. Masks don’t give immunity; rather, the argument is that infections are milder or asymptomatic and allow immunity without severe disease. The article is essentially true to the NEJM commentary, however a reader could become confused and think that the article suggests masks give you COVID-19 immunity.”