Historical account of clinical observations on leprosy and related manifestations in the Comacchio area, Italy, in the XIX century.

Known before Christ and in ancient Egypt, leprosy was believed to be a mysterious disease of supernatural origin. It covered the body with lumps and sores, dulled the senses, produced altered facial features and mutilation of the limbs. By the 6th century AD, the disease had certainly made its appearance in Western Europe and continued to occur in the following centuries. It was also thought to be attributable to poverty and poor sanitation. Leprosy was not considered an infectious disease until 1873, when physician G. H. A. Hansen first identified Mycobacterium leprae , calling it Hansen's bacillus, and the disease was named Hansen's disease. This paper analyses clinical reports on leprosy observed in Northern Italy, in the Comacchio area near Ferrara (Po Delta), in the 19th century, taking into consideration documents and manuscripts of the time. The scholars who made the greatest contribution to the description of the disease in and around Comacchio area were Antonio Campana, Andrea Verga, Alessandro Colla, Clodoveo Biagi, Ottone Schrön, Giacomo Sangalli, Raffaele Cavalieri, and local physicians Cristoforo Belloli, and Francesco Ballotta. Observations on the manifestations of the disease and attempts to cure it, including milk diet, are reported. In particular, this morbid form, which was not found in neighboring territories, was called "Mal di formica" because of its benignity at onset, its slowness and its slow progress. Tubercular Leprosy or Mal di fegato, a form of incurable leprosy was nothing more than the leprosy or elephantiasis described by the Greeks and Hebrews. The people most affected were women, who accounted for two-thirds of the sick. According to some authors, the causes of leprosy could be attributed to overuse of certain rotten or salted fish. Campana was the first to think that a lazaret should be erected for the sick.