Some are given yearly, while others are recommended at specific ages. Side effects are generally mild if they occur. This article discusses vaccines you need as an adult, when to get booster doses, ...
The third scenario, in which the booster dose was with the Pfizer vaccine, showed the highest percentages of effectiveness: 56.8% against symptomatic infections and 85.5% against severe cases.
The findings suggest implications for booster shots. While traditional boosters work well for childhood vaccines by increasing antibody levels, the approach becomes more complex with evolving viruses.