Masking reduces cases of pertussis among patients and health care workers.
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Masking reduces respiratory disease transmission outside of COVID-19.
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Waning immunity could be contributing factor to acquiring pertussis.
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The majority of patients with known exposure to pertussis occurred at school.
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The majority of patients who acquired pertussis were symptomatic when tested.
Narrative abstract
We reviewed cases of Bordatella pertussis (B. pertussis) cases in ambulatory clinics at a large academic health care institution in Los Angeles from 2019-2021. Public health prevention measures during the Coronavirus disease 19 (COVID-19) pandemic impacted the number of pertussis cases identified.