Pfizer says data from the US and Israel suggests that the efficacy of the Covid-19 vaccine it manufactured with BioNTech wanes over time.
The company said that a booster dose is safe and effective at warding off the virus and new variants.
The company detailed its case in a presentation to outside advisers of the US Food and Drug Administration.
The panel is expected to recommend that Americans receive booster shots to maximise protection against the virus.
Moderna reported similar news about its own vaccine.
With less than 3.5% of Africans fully inoculated, headway is being made to secure more shots.
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