Adenovirus pneumonia account for 5%-10% of respiratory tract infections in children. However, it is rarely observed in immunocompetent patients. We sought to describe clinical and CT characteristics of community-acquired Adenovirus pneumonia in immunocompetent adults. Methods: 20 patients with clinically diagnosed adenovirus pneumonia from two hospitals were retrospectively included from January 2018 to December 2019. Medical records and chest CT of all patients were reviewed and summarized.

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... ults: A total of 20 patients who were consisted of 18 men and 2 women with a median age of 36 years-old (range, 18-48). The clinical findings of patients with adenovirus pneumonia is high fever (>39 o C) with the normal white blood cell (WBC) count and decreased Lymphocyte and elevated C-reactive protein. 10 cases complicated with mycoplasma infection when admission. Staphylococcus epidermidis was found in blood culture of 2 patients. CT findings included consolidation in all patients, ground glass opacity (GGO) in 13 patients, and pleural effusion in 12 patients. 13 patients were mechanically ventilated and 2 patients died during hospitalization. Conclusions: The most frequent finding of adenovirus pneumonia on CT was consolidation in the early stage. In adult patients with high fever, normal WBC count and decreased Lymphocyte, consolidation with/without GGO in the early stage may be a clue for suspecting adenovirus pneumonia. Background Adenovirus is a double-stranded DNA virus widely distributed in nature. It is mainly transmitted through the respiratory tract, causing not only upper respiratory tract infections but also pneumonia [1] . Adenovirus pneumonia is more common in children