美国的百日咳发病率正在上升,尤其是在未接种疫苗的人和婴儿当中。 Waning immunity and low vaccination rates are driving a U.S. pertussis rise, especially among unvaccinated people and infants.

据公共卫生官员说,对过去接种疫苗的豁免无望和疫苗接种率下降正促使全美国百日咳病例增加。 Waning immunity from past vaccinations and declining vaccination rates are contributing to a rise in pertussis cases across the U.S., according to public health officials. 这一增加已导致在多个州爆发疫情,未接种疫苗的个人和婴儿的感染率较高,无法得到充分保护。 The increase has led to outbreaks in multiple states, with higher infection rates among unvaccinated individuals and infants too young to be fully protected. 卫生专家敦促加大注射力度,改善免疫覆盖率,以遏制疫情蔓延。 Health experts are urging booster shots and improved immunization coverage to curb the spread.