Understanding the latest COVID-19 developments

Denis Nash, a distinguished professor of epidemiology for the City University of New York's School of Public Health and the executive director of its Institute for Implementation Science in Population Health, joins CBS News' Enrique Acevedo to discuss recent developments related to the COVID-19 pandemic. These include the impending authorization for vaccines for young children, Philadelphia's mask mandate policy reversal, his own COVID-19 research study and more.