Oct 13 (Reuters) - Pfizer (PFE.N) and its German partner BioNTech said their COVID-19 vaccine booster, adapted for the BA.4 and the BA.5 subvariants of Omicron, generated a strong immune response and was well-tolerated in testing on humans.
With the results, which the companies described as consistent with preclinical data, the partners are following up with human trial data that had previously been missing from their successful filings for regulatory approval.
Register now for FREE unlimited access to Reuters.com RegisterThey did not disclose the levels of antibodies generated in the preliminary analysis of the study.
Healthcare regulators for the European Union and the United States had already approved the upgraded shot last month, even though trial data from testing on humans had at the time not been available.
“While we expect more mature immune response data from the clinical trial of our Omicron BA.4/BA.5-adapted bivalent vaccine in the coming weeks, we are pleased to see encouraging responses just one week after vaccination in younger and older adults," said Pfizer Chief Executive Albert Bourla.