A. baumannii is a gram-negative, non-fermenting coccobacillus. It is one of the most prevalent pathogens causing healthcare-associated infections. It causes bloodstream infections, pneumonia, skin and soft tissue infections, and urinary tract infections. A. baumannii is intrinsic resistant to many antibiotics and acquires new resistance mechanism quickly. The carbapenem resistance rate has been increasing. A. baumannii sometimes causes community-acquired infections but almost all patients have underlying diseases.