Yeah, environment and nutrition play a role but more impact may be due to the pre existing health of the population at risk. So if there are more people with chronic illness at the epicenter of the attack, more will die than if it occured in a healthier population.
Agree with better care here. But when a health system is overwhelmed (Wuhan is over 10 million), lot of people will not get enough or prompt care. Also, it is flu season. Many people with any symptom (can be flu or cold and not the Novel coronavirus) will want to be checked and swamp the ER. Treatment is mainly supportive and isolation, and so if they are out of hospital rooms, supplies, healthcare workers, more people will die than otherwise be saved.
That's why they built 2 new hospitals in a week. The epicenter was locked down Jan 22, so about 10 days now. More cases are expected. But I think Canada will be fine.
My hospital in NYC just distributed policies too, and everyone is made to be on alert for travel history and contact with people under investigation for suspected cases.