What does “Booster dose” mean?

• Booster dose is s small extra amount of a medical drug or substance that is given so that a drug or substance given before will continue to be effective                      

Reasons for an additional (Booster) dose.

• Three reasons for an additional (Booster) dose. 

1. The vaccine may not adequately respond to the first two doses for example immune-compromised.  
2. Over time the immunity that we achieved because of being vaccinated starts to wane or deteriorate.
3. The performance of the vaccines might be less or inadequate against some of the new emerged variants.

Current data indicates that most people have strong protection against serious illness and death for at least 6 months after primary vaccination.