Safety and Immunogenicity of Inactivated <i>Bacillus subtilis</i> Spores as a Heterologous Antibody Booster for COVID-19 Vaccines by Johnny Chun-Chau Sung, Nelson Cheuk-Yin Lai, Kam-Chau Wu, Man-Chung Choi, Chloe Ho-Yi Ma, Jayman Lin, Cheong-Nang Kuok, Wai-Leng Leong, Weng-Kei Lam, Yusuf Khwaja Hamied, Dominic Man-Kit Lam, Eric Tung-Po Sze, Keith Wai-Yeung Kwong

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