Objective To characterise the complete case series of influenza A/H7N9 infections as of 27
May 2013, detected by China's national sentinel surveillance system for influenza-like
illness. Design Case series. Setting Outpatient clinics and emergency departments of 554
sentinel hospitals across 31 provinces in mainland China. Cases Infected individuals were
identified through cross-referencing people who had laboratory confirmed A/H7N9 infection
with people detected by the sentinel surveillance system for influenza-like illness, where …