Immunization with monovalent ChAd-SARS-CoV-2-S or bivalent ChAd vaccines protected against weight loss after XBB.1.5 infection, but the differences did not reach statistical significance (Fig. 6d ).
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Mucosal vaccine-induced cross-reactive CD8<sup>+</sup> T cells protect against SARS-CoV-2 XBB.1.5 respiratory tract infection.
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