我細過讀ce bio話疫苗嘅content係dead bacteria and inactive bacteria. Referring to the flu vaccine, the content should be dead or inactive virus, not 菌。 應該唔會令人病,只係stimulate the immune system to manufacture the anti body. Actually, only antigen on the bacteria or virus surface is enough to stimulate our body to manufacture anti body, so it is no necessary to use living bacteria and virus in vaccines.