Pfizer and Moderna’s Covid-19 vaccines are much less effective at preventing infection of senior citizens with the delta coronavirus variant and protection fades rapidly four months after the final jab, new research published in JAMA Network Open has found, as experts race to understand how effective the shots are against the fast-spreading, potentially vaccine-resistant omicron variant. Experts and officials have long warned the immunity provided by vaccines may diminish over time and booster shots—an additional dose of vaccine following the initial course—are frequently deployed in medicine as a way of countering this. One day, it’s possible the definition of “fully vaccinated” will be expanded to encompass a third coronavirus vaccine shot, a regimen common for other vaccines. While preventing infection is important for controlling the spread of disease, it is not the only purpose of vaccination. The shots are still effective at preventing serious illness, hospitalization and death from Covid-19 and experts believe there is strong evidence the vaccines still do this. Early evidence suggests the shots are much less effective at preventing infection with the omicron variant, though still offer strong protection against severe disease. Research into omicron is in its early stages and more information will emerge over time. Scientists Back Boosters To Stop Infection As Study Finds Waning Immunity Months After Second Dose, But Unvaccinated Are Still At Higher Risk (Forbes)COVID vaccine boosters: the most important questions (Nature)Full coverage and live updates on the Coronavirus


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