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In the diseases usually spoken of as contagious it has been customary to insist upon rigid prophylactic measures to prevent the dissemination of the infectious agents. Some other diseases, which at times are transmitted directly from person to person, have received little attention in this direction. Among the diseases referred to may be included pneumonia, tonsillitis and influenza. The clinical observations of a considerable number of physicians furnish almost incontrovertible evidence that lobar pneumonia is something due to the infection of a healthy person by pneumonic sputum. This is especially liable to occur in the person of the nurse or attendant upon the sick, the necessary susceptibility being produced by loss of sleep and general exhaustion. In follicular tonsillitis the evidence of contagion is as convincing as in the so-called contagious diseases. There is no question that influenza is contagious. Because the danger of contagion in lobar pneumonia is not
PROPHYLAXIS IN INFECTIOUS DISEASES.. JAMA. 1902;XXXVIII(22):1447–1448. doi:10.1001/jama.1902.02480220033015
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