Malaria in Narcotic Addicts

To the Editor: —The unusual presence of six cases of malaria at one time in the San Francisco Hospital led to an investigation to determine the source of infection. The accuracy of the department's investigation is plainly manifest. Nothing like this in my experience has ever occurred before. Five of the patients were morphine addicts using the hypodermic method: W., aged 32, quartan type, onset February 1, a guest of the Hunter House, 675 Howard Street; also the Arcade House, 66 Clay Street, at the time of onset. O., aged 45, tertian type, onset February 6, a guest of the New York House, 753 Howard Street. W., aged 41, tertian type, onset February 1, dwelling place unknown. J., aged 42, tertian type, onset February 28, dwelling place unknown. B., aged 39, tertian type, onset February 13, a guest of the Golden Eagle Hotel, 253 Third Street. They were all treated