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[Three cases of pneumonia due to mixed infection of bacteria and Mycoplasma pneumoniae].

We reported three cases of pneumonia due to mixed infection of bacteria (2 cases: Streptococcus pneumoniae, 1 case: methicilline-sensitive Stapholococcus aureus) and Mycoplasma pneumoniae. Increased serum antibody titers of M. pneumoniae were noted in all cases. They were a 36-year-old-female with bronchial asthma, a 74-year-old-male with old pulmonary tuberculosis and a 82-year-old-male with chronic bronchitis. All cases had fever, productive cough with purulent sputum and coarse crackle by auscultation. Leukocytosis was noted in 2 cases. Chest X-ray films showed dense consolidation in all cases, 2 cases were cured by administration of cephems and 1 case was cured by administration of carbapenems and minocycline.