Both vaccines are based on messenger RNA, which delivers genetic code for the coronavirus spike protein to human cells that then grow it on their surface, training the immune system to be ready. The technology is now considered the leading COVID-19 vaccination platform.
The vaccines were tested in trials of thousands of children. They were found to cause similar levels of mild side effects as in older age groups and triggered similar levels of antibodies.
Efficacy against infection was higher for Pfizer, with the company placing it at 80 per cent, compared to Moderna’s estimates of 51 per cent for children aged six-months to two years old and 37 per cent for those aged two to five years.
But the Pfizer figure is based on very few cases and is thus considered preliminary. It also takes three doses to achieve its protection, with the third shot given eight weeks after the second, which is given three weeks after the first.
Moderna’s vaccine should provide strong protection against severe disease after two doses, given four weeks apart, and the company is studying adding a booster that would raise efficacy levels against mild disease.
However, Moderna’s decision to go with a higher dose is associated with higher levels of fevers in reaction to the vaccine compared to Pfizer.
There are some 20 million children aged four years and under in the United States
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