Documents also show that this week six hospitals across the region declared an internal emergency due to a shortage of beds.

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He is quadruple board certified, holding certification in internal medicine, emergency medicine, infectious diseases, and critical care medicine.

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Dr. David Zich, internal medicine and emergency medicine physician at Northwestern Memorial Hospital in Chicago, said this is the worst flu season he's seen in his 12 years at his hospital, in terms of the concentration of patients.

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It described the spread of norovirus coupled with a high number of emergency admissions and a delay in discharges as an "internal major incident".

BBC: Operations cancelled at RCH due to norovirus

"The key thing going forward is we both have big internal plans to ensure we are able to cope with increased emergency demand, " Ms Dugdale said.

BBC: Norwich hospital to draw up ambulance contingency plan

The call was taken by the Dane County 911 center and an internal investigation revealed the dispatcher did not hear any sounds that would signal an emergency.

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"This internal report proves that Londoners are dying unnecessarily because of the underfunding the LAS, " said London Health Emergency campaign director Geoff Martin.

BBC: Ambulance crisis 'killing hundreds'