The White House on Friday refused to release the number of breakthrough COVID-19 cases among vaccinated staff after one aide tested positive for the virus earlier this week. Press secretary Jen Psaki suggested the public did not need that information, even as the U.S. vaccination effort is flagging and COVID cases are surging due to the more contagious delta variant When asked Friday for data on breakthrough cases at the White House, Psaki noted that vaccinated people who have breakthrough infections are much less likely to get severely sick or die. ‘Nothing in this world is 100%’:Those fully vaccinated against COVID-19 can be infected, but serious illness is rare

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