International drug regulators have reached a certain degree of alignment on key principles to support the use of adapted COVID-19 vaccines against Omicron variants of concern, but say that the development of such vaccines is made difficult by the rapid arrival of new variants.
Pace Of Omicron Variants Hindering Work On Adapted COVID-19 Vaccines
The European Medicines Agency says regulators are currently discussing the extent to which clinical data will have to be submitted to support the approval of an adapted vaccine against Omicron variants.

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