President Donald Trump's campaign rallies between June and September may have caused some 30,000 coronavirus infections and more than 700 deaths, according to a new study by Stanford University economists.
The working paper, released late Friday, examined the impact of 18 rallies held between June 20 and Sept. 30 by comparing spread of the virus after each event to parts of the country that didn't host rallies. The findings illustrate the risks of not heeding public health warnings to wear masks and avoid large gatherings to mitigate the risks of Covid-19, the authors — including B. Douglas Bernheim, the chair of Stanford's economics department — wrote.