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. 2021 Apr 22;2(4):261–270. doi: 10.1302/2633-1462.24.BJO-2020-0201

Table I.

COVID-19 alert level.

Stage of outbreak Description
Level 1 COVID-19 is not present within the UK population
Level 2 COVID-19 is present but the number of cases and transmission is low
Level 3 COVID-19 epidemic is in general circulation
Level 4 Transmission of COVID-19 is high and rising exponentially
Level 5 Healthcare services are at risk of being over-burdened by COVID-19