International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases · 2026
Secondary severe acute respiratory syndrome coronavirus 2 transmission from childcare workers versus teachers in school-associated screening events, Okinawa, Japan, January-March 2022.
СтатьяСравнительное исследованиеНазвание и аннотация: Перевод в очереди
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Ogawa Kaoru, Xu Yining S, Shimakawa Yusuke, Chowell Gerardo, Omori Ryosuke, Matsuyama Ryota, Takayama Yoshihiro, Mizumoto Kenji
Аннотация
OBJECTIVES: To compare secondary severe acute respiratory syndrome coronavirus 2 transmission detected through reverse transcription polymerase chain reaction (RT-PCR) screening in childcare and school-aged settings during the Omicron wave.
METHODS: We analyzed Okinawa School PCR Project events from January 1 to March 11, 2022, in which secondary cases were ascertained through school-based RT-PCR screening conducted after the last exposure. Index cases were classified as child/student or teacher/staff. Secondary cases were defined as RT-PCR-confirmed infections detected through school-based screening. We estimated the proportion of events with ≥1 secondary case and the mean number of secondary cases per event (Revent).
RESULTS: Among 897 events with known index case role, 73.1% detected no secondary cases. In nurseries/kindergartens, secondary cases were detected in 32.3% of teacher/staff-index events (Revent: 0.62; 95% confidence interval: 0.53-0.72), compared with 12.8% in elementary and secondary schools (Revent: 0.15; 95% confidence interval: 0.06-0.33). No secondary infections were detected after teacher/staff-index events in junior high (n = 11) or high schools (n = 6).
CONCLUSIONS: Childcare worker-index events in nurseries and kindergartens generated secondary cases in ≈30% of events, whereas teacher/staff-index events in elementary and secondary schools infrequently generated secondary cases under mitigation measures. Prioritizing screening and prevention resources toward childcare workers may improve efficiency when diagnostic capacity is constrained.
METHODS: We analyzed Okinawa School PCR Project events from January 1 to March 11, 2022, in which secondary cases were ascertained through school-based RT-PCR screening conducted after the last exposure. Index cases were classified as child/student or teacher/staff. Secondary cases were defined as RT-PCR-confirmed infections detected through school-based screening. We estimated the proportion of events with ≥1 secondary case and the mean number of secondary cases per event (Revent).
RESULTS: Among 897 events with known index case role, 73.1% detected no secondary cases. In nurseries/kindergartens, secondary cases were detected in 32.3% of teacher/staff-index events (Revent: 0.62; 95% confidence interval: 0.53-0.72), compared with 12.8% in elementary and secondary schools (Revent: 0.15; 95% confidence interval: 0.06-0.33). No secondary infections were detected after teacher/staff-index events in junior high (n = 11) or high schools (n = 6).
CONCLUSIONS: Childcare worker-index events in nurseries and kindergartens generated secondary cases in ≈30% of events, whereas teacher/staff-index events in elementary and secondary schools infrequently generated secondary cases under mitigation measures. Prioritizing screening and prevention resources toward childcare workers may improve efficiency when diagnostic capacity is constrained.