However, vaccination experts are yet to advise if and when children should get the full course – or two doses.
The new study saw researchers conduct a risk/benefit analysis of teenagers aged 12 to 17 getting both doses of the vaccine.
Researchers used historic rates of hospital admission, intensive care support and death among children in England who had Covid-19.
They also examined estimates of long Covid and looked at vaccine efficacy rates and the potential risk of heart inflammation linked to the jab, also known as vaccine-induced myocarditis.
Their study, published in the Journal of the Royal Society of Medicine, suggests the benefits of getting a second jab outweigh the risks “unless case rates are sustainably low”.
As of September 15, around 680 out of every 100,000 10 to 19-year-olds were catching Covid-19 every week.
If this soars to 1,000 per week over a 16-week period, then full vaccination of 12 to 17-year-olds will “avert 4,430 hospital admissions and 36 deaths over 16 weeks”, they estimated.
If cases plummet to 50 per week then “vaccination could avert 70 hospital admissions and two deaths over 16 weeks,” they added.
“Given the current high case rates in England, our findings support vaccination of adolescents against SARS-CoV2.”
It made different estimates based on different assumed rates of long Covid – from an estimate that 14 per cent of children have prolonged symptoms after infection to 2 per cent of children suffering continuing symptoms.
The authors said that vaccination would “avert 56,000, 16,000, or 8,000 cases in 12 to 17-year-olds assuming incidence rates of 14 per cent, 4 per cent, and 2 per cent respectively.”
Lead author, Dr Deepti Gurdasani, of Queen Mary University of London said: “This analysis shows that, on clinical risks alone, vaccination is warranted for 12 to 17-year-olds in England.
“While we wait to understand the long-term effects of Covid-19 on children, the precautionary principle advocates for protecting all children from exposure to this virus and vaccination is a crucial part of that protection.”