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These were more likely to occur after the second dose and in people who received the highest dose, the team reported in the New England Journal of Medicine.
Brazil and some US states see cases climb
COVID-19 cases are skyrocketing in Brazil. The country has registered 41,857 new cases of new coronavirus in the past 24 hours and an additional 1,300 deaths, the health ministry said on Tuesday.
The country recorded 1,926,824 confirmed cases of virus and 74,133 deaths.
The numbers are also increasing in some US states.
Alabama, Florida and North Carolina on Tuesday reported record daily increases in deaths from COVID-19, sinister new milestones that mark a second wave of infections sweeping across much of the United States.