Screening figures

Sir, the pre-visit triage, which practices are advised to do, will preclude any proven or probable COVID-19 patients from attending a practice, leaving only the possible, undiagnosed cases as posing a risk of bringing this infection into a practice. Our city council produces weekly updates of new cases, which gives a good indication of the level of infection in the population which our practice serves. When this figure is combined with the average number of patients that we have seen each week, since lockdown was eased, and the local population, this enables us to quantify the risk of us seeing an undiagnosed COVID-19 patient in the practice. Last week, this indicated that the average risk of seeing such a patient was one every 1,066 weeks, or one every 22.2 years. There are plenty of generalisations used in that calculation but it is certainly food for thought.

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Correspondence to C. Mark.

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Mark, C. Screening figures. Br Dent J 229, 266 (2020).

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