In reply: Katelaris and colleagues raise concerns that uncontrolled before‐and‐after studies are vulnerable to bias and that other factors (eg, the severity of influenza) may have confounded our findings.1 I agree that uncontrolled before‐and‐after studies, being observational studies, are generally prone to different types of bias and that other residual (unmeasured) factors may have confounded our study outcomes.2
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- 1. Wabe N, Li L, Lindeman R, et al. The impact of rapid molecular diagnostic testing for respiratory viruses on outcomes for emergency department patients. Med J Aust 2019; 210: 316–320. https://www.mja.com.au/journal/2019/210/7/impact-rapid-molecular-diagnostic-testing-respiratory-viruses-outcomes-emergency
- 2. Boyko EJ. Observational research — opportunities and limitations. J Diabetes Complications 2013; 27: 642–648.
- 3. Rappo U, Schuetz AN, Jenkins SG, et al. Impact of early detection of respiratory viruses by multiplex pcr assay on clinical outcomes in adult patients. J Clin Microbiol 2016; 54: 2096–2103.
- 4. Rogers BB, Shankar P, Jerris RC, et al. Impact of a rapid respiratory panel test on patient outcomes. Arch Pathol Lab Med 2015; 139: 636–641.
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