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Why Booster Shots Were Introduced
As researchers continued studying COVID-19, evidence showed that immune protection could weaken over time.
This led many health authorities to recommend booster doses.
Booster shots are not unusual in medicine.
Many vaccines require additional doses to maintain strong protection. Examples include:
- Tetanus boosters
- Hepatitis vaccines
- Childhood vaccination schedules
Boosters help remind the immune system how to recognize threats and strengthen antibody responses.
During the pandemic, boosters became especially important for:
- Older adults
- Healthcare workers
- People with weakened immune systems
- Individuals with high exposure risk