That vaccine offered only modest protection against infection.

该疫苗仅提供适度的感染保护。

It is reasonable to expect, based on what we know about immunology and science of this virus, that these new vaccines will provide better protection against infection, better protection against transmission, and ongoing and better protection against serious illness.

根据我们对这种病毒的免疫学和科学知识的了解，我们有理由期望，这些新疫苗将更好地防止感染，更好地防止传播，以及持续并更好地保护人们免受严重疾病的影响。