Scarlet fever Health Article

Definition

Scarlet fever is a disease caused by infection with the group A Streptococcus bacteria (the same bacteria that causes strep throat).

Alternative Names

Scarlatina

Causes, incidence, and risk factors

Scarlet fever was once a very serious childhood disease, but now is easily treatable. It is caused by the streptococcal bacteria, which produce a toxin that leads to the hallmark red rash of the illness.

The main risk factor is infection with the bacteria that causes strep throat. A history of strep throat or scarlet fever in the community, neighborhood, or school may increase the risk of infection.

Symptoms

The time between becoming infected and having symptoms is short, generally 1 - 2 days. The illness typically begins with a fever and sore throat.

The rash usually first appears on the neck and chest, then spreads over the body. It is described as "sandpapery" in feel. The texture of the rash is more important than the appearance in confirming the diagnosis. The rash can last for more than a week. As the rash fades, peeling (desquamation) may occur around the fingertips, toes, and groin area.

Other symptoms include:

• Abdominal pain
• Bright red color in the creases of the underarm and groin (Pastia's lines)
• Chills
• Fever
• General discomfort (malaise)
• Headache
• Muscle aches
• Sore throat
• Swollen, red tongue (strawberry tongue)
• Vomiting

Signs and tests

• Physical examination
• Throat culture positive for Group A Strep
• Rapid antigen detection (throat swab)

Treatment

Antibiotics are used to kill the bacteria that causes the throat infection. This is crucial to prevent rheumatic fever, a serious complication of strep throat and scarlet fever.

Expectations (prognosis)

With proper antibiotic treatment, the symptoms of scarlet fever should get better quickly. However, the rash can last for up to 2 - 3 weeks before it fully goes away.