How contagious is smallpox?
Smallpox is less contagious than chickenpox or measles. The great majority of people in a large room will become infected if even only one person has measles, whereas the highest risk for smallpox is face-to face contact, i.e. within 2 meters (6.5 feet). If there is personal protective equipment (fit-tested N-95 masks, gloves, etc.) on you and the patient, the risk of airborne spread becomes very low.
