Kids also caught measles, mumps, rubella, and chickenpox. Most children recovered from these colds and illnesses on their own, especially if somebody took good care of them while they were sick. Smallpox killed more people. By about 1150 AD, many doctors in Europe had read Ibn Sina's medical encyclopedia, and knew that people caught measles and smallpox and tuberculosis from other people, so they began to try to quarantine sick people. They treated tuberculosis as the Romans had, with good food, rest, and clean air - but also by bleeding the patient.