Statistics for the years 1933 to 1943 have shown a steadily mounting rate of absenteeism in industry due to respiratory diseases. The rate for 1942 was higher than that of any previous year of the ten year period 1933 to 1942, and in 1943 there was a further striking increase in the frequency of respiratory diseases. Stuart Mudd1 suggests that the causes of this increasing rate of industrial disability due to respiratory diseases are to be looked for in overcrowding of workers in ill ventilated common carriers, trains, street cars and busses, rather than in the conditions of work in industrial establishments alone. He calculates that for the year 1943 there were lost to industry in the United States through respiratory diseases 128,000,000 man days and 93,000,000 woman days, or over 220,000,000 person days, or more than one third of the total number of person days lost to American
CONTROL OF AIR BORNE INFECTION. JAMA. 1945;129(8):552–553. doi:10.1001/jama.1945.02860420020010
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