The Pediatric infectious disease journal · 2026
School-age Children as the Dominant Source of Inter-seasonal Influenza Circulation in the Republic of Korea, 2022-2025.
СтатьяНазвание и аннотация: Перевод пока не подготовлен
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Shim Young Kyu, Kang Changmin, Choi Youn Young, Yoo Young, Yoon Yoonsun, Kim Yun-Kyung, Choe Young June
Аннотация
BACKGROUND: Influenza circulates at low levels during summer inter-seasonal periods, potentially bridging consecutive epidemics. Which age groups contribute most to this residual circulation is not well characterized.
METHODS: We analyzed weekly influenza detection rates from the Korea Sentinel Surveillance System (K-SenS), stratified by 6 age groups, from 2022 to 2025 (209 weeks). The inter-season was defined as epidemiologic weeks 21-39. For each age group, we calculated the mean inter-season detection rate, the residual fraction (inter-season rate/season rate), dominance weeks (weeks with the highest detection rate), lag-1 autocorrelation of weekly rates and normalized post-peak decay curves.
RESULTS: Influenza was detected during the inter-season in all age groups. Mean inter-season detection rates were highest in children 7-12 years (6.3%) and 13-18 years old (5.2%). The residual fraction was similar across all ages (19.6%-25.6%). However, children 7-12 years old had the highest detection rate in 42% of active inter-season weeks and showed the highest lag-1 autocorrelation (0.44), indicating sustained rather than sporadic circulation. At 15 weeks after the season peak, children 7-12 years of age retained approximately 55% of their peak detection rate, compared with below 10% in adults ≥50 years old.
CONCLUSIONS: School-age children, particularly those 7-12 years of age, were the dominant source of inter-seasonal influenza circulation in Korea. Their dominance was driven by high seasonal burden rather than slower viral clearance. Maintaining high vaccination coverage in this age group may help reduce inter-seasonal virus reservoirs.
METHODS: We analyzed weekly influenza detection rates from the Korea Sentinel Surveillance System (K-SenS), stratified by 6 age groups, from 2022 to 2025 (209 weeks). The inter-season was defined as epidemiologic weeks 21-39. For each age group, we calculated the mean inter-season detection rate, the residual fraction (inter-season rate/season rate), dominance weeks (weeks with the highest detection rate), lag-1 autocorrelation of weekly rates and normalized post-peak decay curves.
RESULTS: Influenza was detected during the inter-season in all age groups. Mean inter-season detection rates were highest in children 7-12 years (6.3%) and 13-18 years old (5.2%). The residual fraction was similar across all ages (19.6%-25.6%). However, children 7-12 years old had the highest detection rate in 42% of active inter-season weeks and showed the highest lag-1 autocorrelation (0.44), indicating sustained rather than sporadic circulation. At 15 weeks after the season peak, children 7-12 years of age retained approximately 55% of their peak detection rate, compared with below 10% in adults ≥50 years old.
CONCLUSIONS: School-age children, particularly those 7-12 years of age, were the dominant source of inter-seasonal influenza circulation in Korea. Their dominance was driven by high seasonal burden rather than slower viral clearance. Maintaining high vaccination coverage in this age group may help reduce inter-seasonal virus reservoirs.