The administration of Pfizer's bivalent COVID-19 vaccine targeting the Omicron subvariants BA.4 and BA.5 will begin on Monday amid a resurgence of infections this winter.

Health authorities said that starting Monday, the nation will begin vaccinations for those who made reservations for Pfizer’s BA.4 and BA.5-adapted bivalent vaccine.

Eligible people are all adults aged 18 and older who completed primary vaccinations. Same-day vaccinations with leftover doses will also be available from Monday.

The country has already started administering booster shots with Moderna and Pfizer’s COVID-19 vaccines designed to combat the BA.1 variant from last week.

Individuals can choose among three types of booster vaccines – Moderna and Pfizer shots against the BA.1 variant, and Pfizer shots against the BA.4 and BA.5 variants.