Common signs of infection in a wound include:

The correct answer identifies key indicators of infection that are commonly observed in a wound. Erythema, or redness around the wound, is a classic sign of inflammation and potential infection. This occurs as the body's immune response is initiated to combat pathogens. Purulent drainage indicates the presence of pus, which typically consists of dead white blood cells, bacteria, and tissue debris, and signifies that the body is fighting an infection.

In contrast, pallor and decreased temperature are not typical signs of infection; rather, they can suggest decreased blood flow or systemic issues. An increased appetite does not correlate with infection and is generally associated with better health or recovery. Finally, reduced pain levels can suggest healing rather than infection, as infections often cause increased pain due to inflammation and irritation of tissues. Understanding these signs is crucial for effective monitoring and management of wounds in the perioperative setting.