Radiological Features of Human Infection with Avian Influenza A H7N9 Virus: A Report of Three Cases.

Human infection with avian influenza A H7N9 virus has emerged in China with high morbidity rates. Patients usually present with severe and rapidly progressive pneumonia. Therefore, radiological findings are important to diagnose and evaluate disease severity. The clinical characteristics of three new cases of H7N9 virus infection were analyzed, especially the radiological findings, and previously published studies regarding H7N9 virus infection were summarized. Ground-glass opacification and areas of consolidation were the most common image features. Although drug resistance has been found in some H7N9 viruses, oseltamivir administration is still recommended as soon as possible. Moreover, timely epidemiological surveillance is needed, and a new vaccine is expected for the management of avian influenza.