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Updated: Jun 12, 2026

Visualization of Streptococcus pneumoniae within Cardiac Microlesions and Subsequent Cardiac Remodeling
Published on: April 7, 2015
[A case of drug-induced pneumonia caused by clopidogrel]
Gakuya Tamagaki1, Haruhiko Matsushita, Tomohiro Suzumura
1Department of Internal Medicine, Ikuwakai Memorial Hospital.
Abstract:
A 65-year-old man, who had been given a diagnosis of angina pectoris, developed pneumonia 6 months after the initiation of clopidogrel to inhibit platelet aggregation. Chest radiography showed bilateral invasive shadows, and he was admitted to our hospital. He was asymptomatic, but his C-reactive protein and erythrocyte sedimentation rate were elevated. A lymphocyte stimulation test (DLST) with clopidogrel was positive, and bronchoalveolar lavage fluid showed an increase in lymphocytes and a decrease in the CD4+/CD8+ ratio. We noticed no radiologic improvement a week after prednisolone therapy (30 mg/day) with clopidogrel as stated. However, the airspace consolidation had slightly reduced after clopidogrel was halted. We found a few cases of ticlopidine-induced pneumonia, in the literature, but we found no cases of pulmonary adverse events caused by clopidogrel. To the best of our knowledge this is the first case of clopidogrel-induced pneumonia.
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