TGA grants provisional approval to Pfizer’s COVID-19 bivalent (COMIRNATY Original/Omicron BA.4-5 COVID-19 vaccine) booster dose vaccine

On Friday 20 January 2023, the Therapeutic Goods Administration (TGA) granted provisional approval to Pfizer’s bivalent COVID-19 vaccine: tozinameran and famtozinameran (COMIRNATY Original/Omicron BA.4-5 COVID-19 vaccine) for use as a booster dose in individuals aged 12 years and older. The new bivalent vaccine comprises 15 micrograms of famtozinameran based on the Omicron variants BA.4 and BA.5, and 15 micrograms of tozinameran based on the original strain of SARS CoV-2.

This is the first vaccine provisionally approved by the TGA that is designed to specifically target the Omicron variants BA.4/BA.5 and follows provisional approval of the Pfizer BA.1 Omicron/original bivalent vaccine on 27 October 2022.

In making this regulatory decision, the TGA carefully considered data from an ongoing Phase II/III study, which showed that the vaccine elicited a satisfactory neutralising antibody response against the Omicron BA.4/BA.5 strain and against the ancestral strain one month after the booster dose. The vaccine also elicited a good neutralising antibody response against a number of other currently circulating and emerging variants.

Evidence from extensive use in the US and Europe over recent months has also shown that this booster provides clear reductions in hospitalisation and death. This vaccine has a similar safety profile to the original COMIRNATY booster.

The decision to approve COMIRNATY Original/Omicron BA.4-5 COVID-19 vaccine was informed by export advice from the Advisory Committee on Vaccines, an independent committee with expertise in scientific, medical and clinical fields and including consumer representation. The potential use of this vaccine in the national COVID-19 vaccination program is still to be determined. The Australian Technical Advisory Group on Immunisation (ATAGI) will provide advice to the Government on these matters in coming weeks.

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