Atypical measles in adolescents: evaluation of clinical and pulmonary function.

During a community outbreak of measles, 10 patients aged 11 through 19 were hospitalized with prominent pulmonary infiltrates and clinical manifestations of high fever and rash. Diagnoses of atypical measles were confirmed by hemagglutination-inhibition and complement-fixation antibody studies. Patients were followed with pulmonary function studies for 12 weeks. The most common admitting diagnoses were varicella, scarlet fever, meningococcemia, and Rocky Mountain spotted fever, due largely to the protean cutaneous manifestations. Roentgenographic studies showed diffuse, segmental, and nodular chest lesions. Hypoxemia (mean arterial Po2, 58 mm Hg) and markedly reduced lung volumes were noted. Gradual resolution of physiologic abnormalities was noted during 12 weeks, but two children had persistent nodular densities seen on chest roentgenograms. Atypical measles in the older child and young adult has a wide spectrum of pulmonary manifestations ranging from acute respiratory failure to isolated nodular lesions. Proper recognition of this syndrome will prevent unnecessary invasive diagnostic procedures.