The presence of infection in a surgical wound requires a dressing that can actively reduce microbial load. Silver-impregnated dressings release silver ions, which have broad-spectrum antimicrobial properties effective against bacteria, fungi, and some viruses. This helps to control infection and promote healing by reducing bioburden. Unlike hydrocolloid or transparent film dressings, silver dressings are specifically designed for infected or heavily colonized wounds. Alginate dressings mainly provide absorption but lack intrinsic antimicrobial action. Therefore, silver-impregnated dressings are the most appropriate choice for infected surgical wounds to manage and prevent further infection.

Reference: Bailey & Love's Short Practice of Surgery, 28th Edition.