Seperti imuniti semulajadi yang terbentuk akibat jangkitan COVID-19, imuniti yang terbentuk selepas lengkap vaksinasi menurun selepas tempoh tertentu. Pemberian dos penggalak amat disyorkan bagi mengembalikan perlindungan terhadap COVID-19 ke tahap optimum.
Tempoh penerimaan dos penggalak berbeza berdasarkan jenis dos primer dan ianya boleh dari jenis yang sama (homologus) atau dari jenis yang berbeza (heterologus), mengikut jenis yang disyorkan Jawatankuasa Kerja Teknikal dan Pekeliling KPK Bil 1/2022

Similar to the development of natural immunity after being infected by COVID-19, the immunity formed after completion of vaccination decreases after a certain period of time. Administration of booster dose is highly recommended to restore the protection against COVID-19 to an optimal level.
The interval between booster dose and primary dose varies depending on the type of primary dose that had been received. Booster doses can be given either with the same type (homologous) or different type (heterologous) based on advise from the Technical Working Task Force and Director General of Health's circular No.1/2022.

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