Define infection. Differentiate between endogenous and exogenous infections. What is the role of bacterial toxins in causation of diseases

Infection is the invasion and multiplication of microorganisms such as bacteria, viruses, fungi, or parasites in the body, which can lead to tissue damage and provoke an immune response. These microorganisms can be either harmful or benign, but when they disrupt the normal functioning of the host organism, they result in an infection. The body’s immune system typically works to eliminate these invaders, but if the immune response is overwhelmed or the pathogens are particularly virulent, the result can be disease.

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