Americans likely to start getting Pfizer vaccine this week

Pfizer and BioNTech’s Covid-19 vaccine was found to be strongly protective against Covid-19 and gave a high level of protection 10 days after the first shot, according to research data made public on Tuesday for the first time.

The data offer the world’s first detailed look at the evidence behind the shots.

The vaccine worked well regardless of a volunteer’s race, weight or age, the data showed. While the trial did not find any serious adverse events caused by the vaccine, many participants did experience aches, fevers and other side effects.

Of the 38,000 people in the trial, 84 per cent had a reaction on the site of the injection, and 63 per cent reported fatigue. More than half, 55 per cent, suffered headaches and 38 per cent had chills.