Chen et al.’s study [ 28 ] found that the proportion of women of childbearing age with Anti-PT-lgG <5 IU/mL was 66.66%, 65.99%, and 70.24% in the years 2018–2020, showing an increasing trend in susceptibility.
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Seroepidemiology of pertussis in Huzhou: A population-based, cross-sectional study.
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