History of infectious diseases development in the Old and the Middle Ages with the emphasis on the plague and leprosy.

For centuries branded as enigma infectious diseases are as for the common man, and the scientific community, the largest item of interest. Their contagiousness, number, as well as increasing diversity, led to the appearance of enormous challenges in finding the cause for a more effective control. Mass infectious diseases such as leprosy and plague were witnesses and causes of horrific suffering throughout the ages. The valuable data available to us, recorded by the physicians and historians, are the best proof of undisputed reign of illness that marked the old and middle ages.