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During all military activities, there is a background level of sub-clinical influenza-like illness (ILI), which may be symptomatic but does not require clinical or public health action.1 Identifying when the rate of ILI exceeds expected levels can give early warning indications of an emerging outbreak.2 In high-density institutions, such as military settings, there is an increased risk of rapid transmission of respiratory illness leading to large outbreaks and therefore increased morbidity and mortality.3 Early identification of exceedances allows rapid implementation of control measures to limit transmission, minimise morbidity or isolation and thereby maintain operational effectiveness.
High levels of ILI and hospitalisation associated with this had been reported in the 2022–2023 winter season on a 5-week rotational military activity in high-density accommodation in the …
Footnotes
Contributors HT is the guarantor. HT, DS, AM and SE conceived the idea. HT and MD determined the best comparator. DS and SE undertook the data collection and investigation. HT undertook the analysis. All authors contributed to the draft and revisions.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.