An Uncommon Case of Secondary Organizing Pneumonia Due to Influenza A Infection.

Secondary organizing pneumonia (SOP) is defined as a lung disease process caused by pulmonary tissue injury. SOP may rarely occur after influenza A infections, including H1N1 influenza A. We present a case of a 62-year-old woman who was diagnosed with viral pneumonia caused by type A influenza, which was confirmed by nasopharyngeal swab reverse transcription-polymerase chain reaction (RT-PCR). Her abnormal chest shadows and oxygen demand did not improve despite antiviral therapy. Given her clinical deterioration, a high-resolution CT of the chest (HRCT-chest) was done, which confirmed SOP. She was managed with methylprednisolone pulse therapy followed by a tapering regime in addition to standard treatment. This report underscores the need for physicians to remain vigilant about the possibility of OP even in cases of viral pneumonia.