From Helen D. Haller, Pittsford, New York, US
As a well-off white person from the US who gets flu shots regularly and has had a lifetime of vaccinations (including BCG as a teenager), the article on the boost they may bring to innate immunity against the coronavirus made me feel very hopeful 3 April, p 40.
I wonder whether the large disparity in severe cases and deaths from covid-19 among some ethnic groups might be due to those affected not getting nearly as many of those jabs.
