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Any decision of the causal factors in tuberculosis must take into account the fact that tubercle bacilli are the true causative agents; hence the discussion must necessarily devolve into a consideration of the conditions that affect the dissemination of the bacilli. The contrast in the incidence of tuberculosis in two towns in the same county was the impetus that started the present investigation. Jarrow and Blaydon in the county of Durham have a population of 32,000, but the tuberculosis morbidity of Jarrow is much higher than that of Blaydon. Overcrowding is given initial importance. This is a factor that has long been recognized as of importance in the transmission of tuberculosis, yet it cannot be overstressed as long as undiagnosed cases of tuberculosis and carriers of tubercle bacilli are free to infect their associates. "Intimate and prolonged" contact carries a definite meaning to all workers in tuberculosis, and overcrowding in
Causal Factors in Tuberculosis: A Report of an Investigation Into the Incidence of Tuberculosis in Certain Tyneside Districts. JAMA. 1934;102(10):794. doi:10.1001/jama.1934.02750100060030