We've been answering some of your coronavirus questions on the BBC News channel.
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Krys from London says: "Having been vaccinated with the Moderna jab I'm being told that I'm not eligible for a booster - apparently Moderna vaccines do not fade as other vaccines do - is that true?"
Our health correspondent Anna Collinson says: "That's incorrect."
She says the UK Health Security Agency believes that two doses of a vaccine is not enough to stop us catching the Omicron variant but three doses prevents 75% of infections.
She says: "Now they only looked at AstraZeneca and Pfizer, there wasn't enough data for Moderna but they didn't think there would be any difference between Moderna and say Pfizer because they're the same type of vaccine. So the message to Krys would be to make sure they get their booster jab."