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The routine examination of the lungs of a large number of soldiers at Vancouver Barracks, a post where demobilization took place early, and where the epidemic ocurred comparatively late, showed that certain physical signs persisted at the hilum of the lungs for a considerable length of time after apparent recovery from the epidemic disease. A large proportion of these patients showed no symptoms, but occasionally one complained of cough. This finding suggested a careful investigation of the lungs of all patients evincing any symptoms of septic absorption, regardless of whether or not there was anything to suggest lung involvement. The routine examination has demonstrated that findings persist at the hilum either as an accompanying condition or as the cause of lowered resistance in a considerable number of patients. The most frequent complaint is that of prostration. Various myalgias, headache, backache, neuralgias and vague or localized joint pains are usually present;
Arnold HS. LATENT INFECTION AT THE HILUM FOLLOWING INFLUENZA. JAMA. 1919;72(19):1363. doi:10.1001/jama.1919.26110190002009a
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