A health worker holds a vial of the Pfizer-BioNTech COVID-19 vaccine as they are thawed in a lab at the UZ Leuven hospital in Leuven, Belgium, Sunday, Dec. 27, 2020.

Video. UK to fast-track COVID-19 vaccines modified to combat new variants

The UK, Australia, Canada, Singapore and Switzerland plan to fast-track modified COVID-19 vaccines so they can tackle new variants more swiftly.

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