biostudies-literatureUnknown18(43)Kim HJ<h4>Objectives</h4>Since 2024, the number of pertussis cases in the Republic of Korea has rapidly increased, resulting in a nationwide outbreak. We analyzed the epidemiological characteristics and trends associated with this foutbreak, examined its potential causes, and described the public health responses implemented to date, to provide foundational evidence to inform future policy development.<h4>Methods</h4>Data were obtained from January 2024 to June 2025, and included case notifications from the surveillance and immunization systems of the Korea Disease Control and Prevention Agency, individual case investigation forms, and outbreak reports. Descriptive statistics were used to analyze patient age, regional distribution, clinical symptoms, outbreak status, and vaccination status.<h4>RJugan geon-gang gwa jilbyeong1631-1651https://www.ebi.ac.uk/biostudies/studies/S-EPMC12603801biostudies-literature[Pertussis Surveillance and Occurrence Report in the Republic of Korea: from 2024 to the First Half of 2025].PMC12603801Kim DKim HJYang JSLee JWang EShin JPark SSeo SKo SYKim YKPark YJYun YLee WAhn Sfalse[Pertussis Surveillance and Occurrence Report in the Republic of Korea: from 2024 to the First Half of 2025].<h4>Objectives</h4>Since 2024, the number of pertussis cases in the Republic of Korea has rapidly increased, resulting in a nationwide outbreak. We analyzed the epidemiological characteristics and trends associated with this foutbreak, examined its potential causes, and described the public health responses implemented to date, to provide foundational evidence to inform future policy development.<h4>Methods</h4>Data were obtained from January 2024 to June 2025, and included case notifications from the surveillance and immunization systems of the Korea Disease Control and Prevention Agency, individual case investigation forms, and outbreak reports. Descriptive statistics were used to analyze patient age, regional distribution, clinical symptoms, outbreak status, and vaccination status.<h4>R2025-01-01T00:00:00Z2025 Nov2026-06-06T14:36:26.45Z2026-05-31T03:10:07.725ZS-EPMC126038014133317810.56786/PHWR.2025.18.43.1