What does the presence of pus indicate?

The presence of pus is a strong indicator of infection. Pus is a thick fluid that is often produced at the site of an infection, particularly due to the body's immune response to pathogens such as bacteria. When the body detects an infection, white blood cells, especially neutrophils, are mobilized to the site of injury or infection. These cells work to engulf and destroy the invading microorganisms, and in the process, they can accumulate, leading to the formation of pus.

Pus typically consists of dead white blood cells, bacteria, and tissue debris, contributing to its characteristic appearance and consistency. This bodily response is crucial, as it serves as part of the immune defense mechanism, highlighting that the body is actively working to fight off the infection. Therefore, when pus is observed, it is a clear sign that an infection may be present, necessitating further medical evaluation and potential treatment.