Which of the following is a symptom of a localized infection?

A localized infection is characterized by symptoms that are restricted to a specific area of the body where the infection has occurred. Redness and swelling at the infection site are typical manifestations of inflammation, which is the body's immediate response to infection. This localized response can also include warmth and pain in the affected area, indicating that the body is sending increased blood flow and immune cells to fight off the invading pathogens.

Infections that result in systemic responses, such as fever, chills, general malaise, or fatigue, usually suggest a broader infection affecting the entire body rather than one focused on a specific site. Therefore, while those symptoms may indicate the presence of an infection, they are more aligned with systemic rather than localized infections. Redness and swelling specifically highlight the localized nature of the infection, making it the clear choice in this context.