"Pulmonary Tuberculosis: Is Resurgence Due to Reactivation or New Infection?."

According to the author's abstract of an article published in Postgraduate Medicine, "Spread of tuberculosis consists of three phases: In the transmission phase, Mycobacterium tuberculosis is transferred from a source to a host via aerosolization of respiratory secretions. During the infective phase, the organism establishes itself within the lung of the new host. In the pathogenetic phase, organism- and host-related mechanisms bring about clinical disease. In the past, the vast majority of cases of tuberculosis in the United States were assumed to be reactivation of dormant disease. However, the pathogenesis has increasingly shifted to progressive primary disease. This shift...

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