A panel advising the US Food and Drug Administration (FDA) is meeting to debate the need for additional doses of the Moderna and Johnson & Johnson vaccines.

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On Thursday, Moderna received a unanimous FDA panel vote in favour of a half-dose booster - but this has not been fully authorised just yet.

The meetings this week come one month after the FDA authorised Pfizer booster jabs for some Americans, including those over 65 or at higher risk of severe illness and who work in frontline jobs.

Prior to the FDA's decision, an advisory panel at the Centers for Disease Control and Prevention (CDC) had recommended that only those above 65 and immunocompromised people between 50 and 64 receive boosters.

The Biden administration and the pharmaceutical companies involved have all offered broad support for boosters.

While the approval meant that tens of millions of US residents became eligible for a third jab, Americans across the country remain confused about boosters, who needs them and how they help.

Here's what we know so far.