The vaccine needs to be administered regularly to counter waning immunity and fight new variants.
READ MORE:The COVID-19 vaccine protests against serious illness and death, but immunity can wane significantly over time - leading to calls for an annual vaccination program.
An annual single-dose campaign was compared against four other scenarios involving booster shots for a range of different age groups and at different time intervals. For a population the size of the United States, it also represented a dollar-value savings of $US3.53 billion in direct healthcare costs alone.
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