Reports of cases of an unclassified disease were first received by the New York City Department of Health toward the end of June, 1946. Most of the cases came from a single housing development covering three square blocks in one of the five boroughs of the city. As news of the disease spread among physicians, cases located in three other boroughs were called to our attention. This report of the clinical findings is based on the observation of 144 nonfatal cases. Most of the patients were observed during the course of their illness, but some wereseen only after recovery.
The etiology,1 epidemiology2 and method of transmission3 of the disease are considered in other papers in this series. Identical strains of rickettsias have been isolated from the blood of 2 patients1 and from two pools of rodent mites, Allodermanyssus sanguineus (Hirst).3a The name rickettsialpox has been
GREENBERG M, PELLITTERI O, KLEIN IF, HUEBNER RJ. RICKETTSIALPOX—A NEWLY RECOGNIZED RICKETTSIAL DISEASE: II. Clinical Observations. JAMA. 1947;133(13):901–906. doi:10.1001/jama.1947.02880130001001
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