Up until now, we had two big unanswered questions regarding COVID19 vaccines in the United States: Can we safely mix vaccines? For example, if you had an original Johnson and Johnson (J&J) vaccine can you safely get a Moderna booster? We know that mixing AstraZeneca with Pfizer is safe from clinical trials in the UK. Because J&J is the same biotechnology as AstraZeneca, we hypothesized that mixing would be okay too. But needed to see the data.
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