The weather was not thought to have been a contributory factor, police said.
Inquests into 10 other deaths at the hospital in 2009 found that drugs were a contributory factor in some cases.
Every time someone comes through accident and emergency with any sort of injury where alcohol is a contributory factor the police are informed.
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Experts currently use a 'guesstimate' that 5, 000 deaths per year are caused by HAIs, and it is a contributory factor in around 15, 000 more.
Onshore studies show that around 60% of major accident incidents are related to technical integrity, and of these half have ageing as a contributory factor.
Police said freezing road conditions may have been a contributory factor.
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Mr Wahid said the Norovirus could be a possible contributory factor to the increase in the number of patients.
"That risk can be reduced by simple lifestyle changes, such as not smoking, drinking alcohol sensibly, exercising regularly and eating a healthy, balanced diet to reduce the risk of obesity - a major contributory factor increasing the risk of diabetes and eventually cardiac disease, " he added.
Police have not revealed what additional injuries Ms Chambers had sustained, but said post-mortem examinations carried out on Tuesday showed the "major contributory factor" in her death was a bullet wound to the abdomen.
Post-mortem examinations carried out on Tuesday showed the "major contributory factor" in the death of Ms Chambers was a bullet wound to the abdomen, police said.
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