Scroll through the chart below to see which side effects ... That's relatively similar to the reported side effects after one dose of Moderna's vaccine: About 57% of people younger than 65 in ...

The shot is also effective at a lower dose than the previous version. Moderna is trying to chart its post-pandemic future while competing with Pfizer for share of the COVID vaccine market.

A 2-dose regimen All three of the leading vaccines require two shots. Pfizer's doses are given three weeks apart, while Moderna and AstraZeneca's are administered at least a month apart.

#TeamPfizer and #TeamModerna are two of the captions often found next to selfies of proud newly vaccinated people on social media. And both groups do have a reason to celebrate as the two mRNA ...