<human>:  Where did scarlet fever originate?
<bot>: Scarlet fever is a bacterial infection that was first described in the 18th century. It is caused by the bacterium streptococcus pyogenes. It is named for the characteristic red rash that appears on the body of infected people. The disease is spread through close contact with an infected person, usually through coughing or sneezing. It is most common in children, but can also affect adults.