Erratum: A bacterial extracellular vesicle-based intranasal vaccine against SARS-CoV-2 protects against disease and elicits neutralizing antibodies to wild-type and Delta variants

更正：一种基于细菌细胞外囊泡的鼻内疫苗可预防SARS-CoV-2感染，并能诱导产生针对野生型和Delta变异株的中和抗体。