The CDC Keeps Changing Its COVID-19 Guidance: Here's What the Science Says About Transmission and Testing

The CDC has reversed its coronavirus recommendations yet again - this time backtracking on guidance about how the virus spreads through the air. But these changes may reflect political concerns rather than the latest scientific evidence, according to Alison Galvani, the Director of Infectious Disease Modeling and Analysis at Yale University. She breaks down what the science says about COVID-19 transmission and testing.