In the pathogenesis of periprosthetic joint infection (PJI), Staphylococcus epidermidis primarily utilizes which of the following mechanisms to confer profound resistance to host immune clearance and systemic antibiotics?

Explanation:
Staphylococcus epidermidis, a coagulase-negative staphylococcus, is a leading cause of chronic periprosthetic joint infections. Its primary virulence factor is the ability to produce a glycocalyx—specifically, a polysaccharide intercellular adhesin (PIA)—that allows it to adhere firmly to inert implant surfaces and form a dense biofilm. This biofilm severely restricts the penetration of antibiotics and prevents phagocytosis by host immune cells. Intracellular survival and PVL are more characteristic of S. aureus. Reference: Campbell's Operative Orthopaedics, 14th Edition.