Why Some Vaccinated People Still Get Covid

In this week's edition of the Covid Q&A, we look at when a person who has been fully vaccinated still develops Covid-19, or what’s known among epidemiologists as a “breakthrough” infection. In hopes of making this very confusing time just a little less so, each week Bloomberg Prognosis is picking one question sent in by readers and putting it to an expert in the field. This week's question is:

Why do some people get Covid-19 infections even though they were recently vaccinated?