to stop from achieving something - from Pandemic stymies travel aspirations

the ratio of the number of seats occupied in an aircraft to the number available - from Airlines nervous over Songkran

when healthcare workers directly engage members of a community to find cases of a disease - from Only 27 new local Covid cases

to treat a person or animal with a vaccine to produce immunity against a disease - from Anutin denies vaccine plan too slow

when most of a population is immune to an infectious disease - from Anutin denies vaccine plan too slow