Acute hepatic insults including hepatitis flare-up, active alcohol assumption and hepatotoxic drug use are common in patients with cirrhosis especially in Eastern countries.These patients are at high risk of developing acute-on-chronic liver failure (ACLF) and associated with high short-term mortality. And the natural history of these patients is frequently complicated by bacterial infections, which lead to deterioration of underlying diseases. The present study is aimed to investigate the prevalance and risk factors of bacterial infections in those patients and its impact on in-hospital/short-term mortality.