AstraZeneca has been informed that it may have provided outdated data on the efficacy of its COVID-19 vaccine from a large-scale clinical trial in the U.S. It is just the latest public misstep for the company’s rollout of its vaccine, which has been plagued with confusion over data from past clinical trials along with recent reports linking the shot to blood clots in Europe. U-B-C adjunct infectious diseases professor Dr. Horacio Bach joins Newsday to talk more about the issue.