Final answer:
Among the most common causative agents of SSIs are bacteria known as Staphylococcus aureus, which is a serious concern due to its possible antibiotic resistance. Staphylococcus epidermidis is also notable for being frequently associated with nosocomial infections transmitted through medical devices.
Step-by-step explanation:
The most common causative agents of Surgical Site Infections (SSIs) are commonly found to be bacteria such as Staphylococcus aureus and Staphylococcus epidermidis. S. aureus is particularly associated with wound infections and can be serious due to its potential resistance to antibiotics. Nosocomial infections, also known as hospital-acquired infections, can be caused by various bacteria, including S. epidermidis, which is frequently associated with infections transmitted via medical devices inserted into the body.