Levels of priority at A&E departmentsPatients who go to the A&E are categorised into the following four levels of priority for medical attention:

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Doctors, nurses struggle to cope as Covid-19 patients flock to A&E depts, many with mild symptoms

https://www.straitstimes.com/singapore/health/doctors-nurses-struggle-to-cope-as-covid-19-patients-flock-to-ae-depts-many-with-mild-symptoms