Adults can also be infected with scarlet fever and develop a red rash all over the body, but clinically, adults do not get scarlet fever. The cause of scarlet fever is called Streptococcus haemolyticus, and the red rash of scarlet fever occurs because of the exotoxin produced by Streptococcus haemolyticus, also called erythrotoxin, which is divided into only five types, so a person can get scarlet fever up to five times in his or her lifetime. Adults are often exposed to erysipelas toxin as children, and after exposure, the immune system is able to recognize it and control the symptoms of the rash when the streptococcus infects people again, without the red rash of scarlet fever, but only other manifestations of the infection, such as when adults are infected with the hemolytic streptococcus that causes scarlet fever, but the exotoxin produced is destroyed by the adult’s immune system, at which point The red rash of scarlet fever does not appear, but only other signs of infection, such as purulent tonsillitis.