Abstract
Human and animal infections with spirochetes of the genus Leptospira have received increasing attention in recent years. It has been found that at least 30 serologically distinguishable strains of Leptospira are pathogenic for man1and that infections with these organisms may produce a variety of symptoms simulating influenza, infectious hepatitis, infectious mononucleosis, aseptic meningitis, poliomyelitis, brucellosis, tuberculosis, or other diseases. Many examples of such infections have been reported from other countries but relatively few from the United States. It has, however, been demonstrated that leptospiral infections are widespread among domestic animals in this country2and that the conditions necessary for the transmission of these organisms from animals to man are prevalent. It is probable, therefore, that many cases of human leptospirosis occur unrecognized in the United States because of the lack of awareness of these diseases on the part of physicians and the relative scarcity of facilities for

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