Third dose Covid vaccine, Lancet: “Not for everyone”

Third dose of anti covid vaccine, currently available data on vaccine efficacy do not support the need for a new booster for the general population. This is the conclusion of a review conducted by an international group of scientists, including experts from the World Health Organization WHO and the American drug agency Fda, published in ‘The Lancet’. The authors explain that, even against the Delta variant of Sars-CoV-2, the effectiveness of Covid-19 vaccines is such as to make booster doses “inappropriate” for everyone. Read also Researchers analyzed evidence from randomized controlled trials and observational studies published in peer-reviewed journals and pre-print platforms. On average, Covid vaccination shows 95% effectiveness against severe disease caused by both the Delta variant and the Alpha variant of the pandemic coronavirus, as well as more than 80% effectiveness in protecting against any infection associated with these variants. . For all vaccine types and against all variants considered, immunization efficacy is greater against severe disease than for mild forms. And although compared to the protection provided against serious disease, vaccines appear less effective in avoiding asymptomatic infections or transmission of the contagion, “even in populations with high vaccination coverage – the scientists specify – the unvaccinated minority is still the main factor of transmission, as well as being itself at greater risk of serious illness “.