{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,30]],"date-time":"2026-04-30T15:40:23Z","timestamp":1777563623292,"version":"3.51.4"},"reference-count":27,"publisher":"Korean Society of Epidemiology","license":[{"start":{"date-parts":[[2025,12,13]],"date-time":"2025-12-13T00:00:00Z","timestamp":1765584000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["e-epih.org"],"crossmark-restriction":true},"short-container-title":["Epidemiol Health"],"abstract":"<jats:p>OBJECTIVES: In 2024, Korea experienced a nationwide pertussis epidemic, with Gyeonggi Province accounting for nearly one-third of reported cases. This study investigated the epidemiological characteristics of the outbreak and explored the association between vaccination history and healthcare utilization.METHODS: We analyzed 14,275 pertussis cases reported in Gyeonggi Province in 2024 using de-identified national surveillance data. Comparisons were performed by age group (&lt;20 vs. \u226520 years) and vaccination status (&lt;20 years). The chi-square and Mann\u2013Whitney U tests were used, and effect sizes were assessed using Cram\u00e9r\u2019s V.RESULTS: Of all cases, 89.8% occurred in individuals &lt;20 years, particularly those aged 10-14 years. Children and adolescents were more often involved in clusters and had more identified contacts than adults, whereas adults had higher rates of hospitalization (13.2 vs. 5.9%) and emergency visits (4.4 vs. 0.9%; p&lt;0.001). Among individuals &lt;20 years, hospitalization was more common in the unvaccinated or unknown group (11.7%) than in the fully (5.9%) or partially vaccinated (5.5%) groups (p=0.045).CONCLUSIONS: The epidemic was concentrated in school-aged populations, particularly adolescents. While vaccination status showed a limited association with healthcare utilization, individuals who were unvaccinated or had an undocumented vaccination history experienced delayed diagnosis and higher care needs. These findings highlight the importance of strengthening adolescent-focused vaccination strategies and preparedness for future pertussis outbreaks.<\/jats:p>","DOI":"10.4178\/epih.e2025072","type":"journal-article","created":{"date-parts":[[2025,12,15]],"date-time":"2025-12-15T05:54:02Z","timestamp":1765778042000},"page":"e2025072","update-policy":"https:\/\/doi.org\/10.4178\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Epidemiological features of the 2024 pertussis outbreak in Gyeonggi Province, Korea"],"prefix":"10.4178","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5387-3399","authenticated-orcid":true,"given":"Yeon Hwa","family":"Chang","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6607-4756","authenticated-orcid":true,"given":"Kyujin","family":"Chang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4891-0524","authenticated-orcid":true,"given":"Yeong Jun","family":"Ju","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"2679","published-online":{"date-parts":[[2025,12,13]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","DOI":"10.3346\/jkms.2013.28.9.1283"},{"key":"ref2","volume-title":"Paroxysmal coughing, whooping cough, hurry up with additional vaccinations!"},{"key":"ref3","volume-title":""},{"key":"ref4","volume-title":""},{"key":"ref5","doi-asserted-by":"publisher","DOI":"10.1016\/S1473-3099(11)70007-X"},{"key":"ref6","doi-asserted-by":"publisher","DOI":"10.1016\/j.mayocp.2014.08.004"},{"key":"ref7","volume-title":""},{"key":"ref8","doi-asserted-by":"publisher","DOI":"10.1080\/22221751.2024.2389086"},{"key":"ref9","volume-title":""},{"key":"ref10","doi-asserted-by":"publisher","DOI":"10.1038\/embor.2008.110"},{"key":"ref11","doi-asserted-by":"publisher","DOI":"10.4178\/epih.e2022010"},{"key":"ref12","doi-asserted-by":"publisher","DOI":"10.1007\/s40121-021-00520-9"},{"key":"ref13","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0266033"},{"key":"ref14","doi-asserted-by":"publisher","DOI":"10.1016\/j.vaccine.2025.126862"},{"key":"ref15","doi-asserted-by":"publisher","DOI":"10.4178\/epih.e2021053"},{"key":"ref16","doi-asserted-by":"publisher","DOI":"10.3947\/ic.2024.0117"},{"key":"ref17","doi-asserted-by":"publisher","DOI":"10.1016\/j.vaccine.2018.11.009"},{"key":"ref18","volume-title":""},{"key":"ref19","doi-asserted-by":"publisher","DOI":"10.1016\/j.vaccine.2024.06.016"},{"key":"ref20","doi-asserted-by":"publisher","DOI":"10.1016\/j.chest.2023.12.020"},{"key":"ref21","doi-asserted-by":"publisher","DOI":"10.1080\/15412555.2021.1920904"},{"key":"ref22","doi-asserted-by":"publisher","DOI":"10.1093\/infdis\/jiu322"},{"key":"ref23","doi-asserted-by":"publisher","DOI":"10.1016\/j.resp.2013.02.007"},{"key":"ref24","doi-asserted-by":"publisher","DOI":"10.1016\/j.cmi.2016.01.003"},{"key":"ref25","doi-asserted-by":"publisher","DOI":"10.1016\/s0264-410x(99)00539-3"},{"key":"ref26","doi-asserted-by":"publisher","DOI":"10.1128\/CMR.00083-15"},{"key":"ref27","doi-asserted-by":"publisher","DOI":"10.1080\/21645515.2020.1844505"}],"container-title":["Epidemiology and Health"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/e-epih.org\/upload\/pdf\/epih-47-e2025072.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/e-epih.org\/journal\/view.php?doi=10.4178\/epih.e2025072","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/e-epih.org\/upload\/pdf\/epih-47-e2025072.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,2,11]],"date-time":"2026-02-11T00:02:30Z","timestamp":1770768150000},"score":1,"resource":{"primary":{"URL":"http:\/\/e-epih.org\/journal\/view.php?doi=10.4178\/epih.e2025072"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,12,13]]},"references-count":27,"URL":"https:\/\/doi.org\/10.4178\/epih.e2025072","relation":{},"ISSN":["2092-7193"],"issn-type":[{"value":"2092-7193","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,12,13]]},"assertion":[{"value":"2025-08-28","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2025-12-05","order":1,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2025-12-13","order":2,"name":"published","label":"Published online","group":{"name":"publication_history","label":"Publication History"}}]}}