Respiratory Infections and Tumours

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The book delves into the complexity of respiratory tract infections, highlighting the varying clinical syndromes and severities influenced by factors such as the patient's age, fitness, and immunity. It categorizes infections into acute and chronic, with acute cases primarily caused by various microorganisms. The text also emphasizes the body's defense mechanisms, including mechanical barriers like the cough reflex and mucociliary action, which protect against inhaled irritants. Alterations in these defenses can lead to increased susceptibility to infections, particularly in chronic conditions.