Although 10 8 vp Ad26.COV2.S also protected against weight loss upon SARS-CoV-2 B.1.22 challenge, protection against SARS-CoV-2 Gamma and Delta did not reach statistical significance.
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Booster vaccination with Ad26.COV2.S or an Omicron-adapted vaccine in pre-immune hamsters protects against Omicron BA.2.
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