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If you've had omicron before, are you safe from infection by the new variants?

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A woman wears a face shield to protect against COVID-19 at a taxi stand in Soweto, South Africa, where an omicron variant is causing a COVID-19 surge. (Denis Farrell/AP)
A woman wears a face shield to protect against COVID-19 at a taxi stand in Soweto, South Africa, where an omicron variant is causing a COVID-19 surge. (Denis Farrell/AP)

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