In light of current events, Rabbi Asher Weiss, shlit”a presented a shiur on “Coronavirus in Halacha.” How are we supposed to act and react when there is a danger of infectious diseases and of a pandemic? What does the halacha say? How have Gedolei Yisroel ruled throughout the ages in such situations? What is our approach supposed to be? What is defined as risk in a dangerous situation to warrant taking the proper measures to save lives?