“免疫落差”是指不同国家人群之间的免疫力的高低状况。任何国家只要有免疫空白的人群存在，都有可能因为传染源的引入而导致传染病流行。

An immunity gap leads to increased disease incidence, outbreaks and deaths from preventable disease– all of which have no respect for borders.

免疫落差会导致更多病例的出现，疾病的爆发以及可预防疾病带来的死亡，而这些都是不分边界的。

In many contexts, inequities in access to vaccination are increasing the immunity gap and risk for disease outbreaks.

在不同的环境中，不是所有人都有机会打疫苗，这样就加剧了免疫落差和疾病爆发的风险。

The efficient delivery of vaccination service among children is expected to reduce the immunity gap in different regions.

给孩子们高效接种疫苗有望降低不同地区之间的免疫落差。

A vaccination campaign is conducted to close the immunity gap against measles.

正在实施的接种疫苗行动将弥合针对麻疹的免疫落差。