Final answer:
MRSA, VRE, and C. difficile are commonly responsible for healthcare-associated infections (HAI).
Step-by-step explanation:
In healthcare settings, the organisms commonly responsible for healthcare associated infections (HAI) include MRSA, VRE, and C. difficile. MRSA stands for Methicillin-Resistant Staphylococcus aureus, VRE stands for Vancomycin-Resistant Enterococcus, and C. difficile is a bacterium known as Clostridium difficile.