The results show that, compared with individuals who received only two doses five months prior, individuals who received three doses of the vaccine (7 days or more after the third dose) had 92 per cent lower risk of severe Covid-19 disease and 81 per cent lower risk of Covid-19-related death. 🍏 Pfizer-BioNTech’s COVID-19 Vaccine Third Dose More Effective in Reducing Severe Coronavirus Illness: Lancet.