Erythrogenic toxin

Erythrogenic toxin is a type of exotoxin produced by certain strains of the bacterium Streptococcus pyogenes. This toxin is responsible for the characteristic red rash seen in scarlet fever.

Overview

Streptococcus pyogenes is a Gram-positive bacterium that is responsible for a wide range of human diseases, including pharyngitis, impetigo, cellulitis, and necrotizing fasciitis. Certain strains of this bacterium produce erythrogenic toxin, which is one of several exotoxins that S. pyogenes can produce.

Mechanism of Action

Erythrogenic toxin acts by stimulating the release of interleukin-1, interleukin-6, and tumor necrosis factor-alpha from monocytes and macrophages. These cytokines then act on the endothelial cells of blood vessels, causing them to dilate and become more permeable. This results in the characteristic red rash of scarlet fever.

Clinical Significance

The presence of erythrogenic toxin is a key factor in the development of scarlet fever. This disease is characterized by a high fever, sore throat, and a red rash that typically begins on the chest and spreads to the rest of the body. Other symptoms may include headache, nausea, and vomiting. Scarlet fever is typically treated with antibiotics to eliminate the S. pyogenes infection.

See Also

• Exotoxin
• Streptococcus pyogenes
• Scarlet fever