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By the beginning of june 2021, almost 11% of the world’s population had received at least one dose of a coronavirus disease 2019 (covid‐19) vaccine.1 this represents an extraordinary scientific and logistic achievement — in 18 months, researchers, manufacturers and. Other vaccine studies continue to monitor the health of people who have already had a vaccine to determine their effectiveness over a longer period of time.


Covid-19 Vaccine Effectiveness Barely Affected By Delta Variant Research Suggests

They say this decline makes getting a booster shot.

Effectiveness of covid vaccine research. As a result, vaccines that initially offered, say, 90% protection against mild cases of disease might only be 70% effective after 6 or 7 months 1. Researchers observed that after only receiving the first dose, the vaccine’s effectiveness was lower but still significant. “it felt a little bit out on a limb at the time.

Studies suggest that protective immunity remains high, with only slight decreases, over six months. Recent studies show that the pfizer vaccine can reduce transmission of the virus. Community‐based studies in five countries show consistent strong benefits from early rollouts of covid‐19 vaccines.

Such evaluations will help us understand if vaccines are performing as expected outside the more controlled setting of a clinical trial.


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