America is having a D-day moment as it rolls out the largest national vaccination effort in history. Dr. Howard Markel from the University of Michigan School of Public Health says this is an unprecedented time in American public health.

How do coronavirus vaccines work? Dr. Gregory Poland from the Mayo Clinic explains. 

Canada has also begun distributing the coronavirus vaccine. But Prof. Amir Attaran from the University of Ottawa says the Canadian Government is "very, very far behind" the United States. 

The wealthy and powerful may try to pull strings to jump the vaccine lines. Ruth Faden from the Johns Hopkins Berman Institute of Bioethics 

Temperature checks and deep cleanings won't cut it. Dr. Thersa Sweet from Drexel’s Dornsife School of Public Health says many work places are not doing a good job in protecting employees from the virus. 

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