What does the presence of pus indicate in terms of infection?

The presence of pus is a strong indicator of a bacterial infection. Pus is a thick fluid that is typically formed as a result of the body's response to bacterial pathogens. When bacteria invade tissues, the immune system responds by sending white blood cells to the site of infection to fight the invading microorganisms. This influx of immune cells, along with tissue debris, bacteria, and dead cells, creates pus.

Bacterial infections often produce this characteristic response, which may be observed in conditions like abscesses, boils, or infected wounds. The presence of pus signifies that the body is actively responding to an infection, which is predominantly caused by bacteria. Other types of infections, such as viral or fungal infections, usually do not result in pus formation, as they trigger different immune responses. Understanding this relationship helps in diagnosing the type of infection and determining the appropriate treatment.