Overview

Scarlet fever is a bacterial infection that usually develops in people who have strep throat. It is caused by group A Streptococcus bacteria, the same bacteria responsible for strep throat. Scarlet fever is most common in children between the ages of 5 and 15, but it can affect people of any age.

The condition is characterized by a distinctive red rash, high fever, and sore throat. With prompt antibiotic treatment, scarlet fever is usually mild and resolves without long-term problems. However, if left untreated, it can lead to serious complications.

Symptoms

Symptoms of scarlet fever typically appear 1 to 4 days after infection.

Common symptoms include:

  • Sudden high fever

  • Sore throat and pain when swallowing

  • Red, sandpaper-like rash that usually starts on the chest and spreads

  • Flushed face with a pale area around the mouth

  • Red lines in the folds of the skin, especially in the armpits and groin

  • Swollen glands in the neck

  • Headache

  • Nausea or vomiting

  • Strawberry-like appearance of the tongue

The rash usually fades after about a week, and the skin may peel, especially on the fingertips and toes.

Causes

Scarlet fever is caused by group A Streptococcus bacteria that produce a toxin responsible for the red rash. The infection spreads through respiratory droplets when an infected person coughs or sneezes.

It can also spread through close contact or by touching contaminated surfaces and then touching the mouth or nose. People with untreated strep throat are more likely to transmit the infection.

Risk Factors

Certain factors increase the risk of developing scarlet fever:

  • Age between 5 and 15 years

  • Close contact with someone who has strep throat or scarlet fever

  • Attending school or daycare where infections spread easily

  • Weakened immune system

Crowded environments make it easier for the bacteria to spread from person to person.

Complications

Without proper treatment, scarlet fever can lead to serious health problems.

Possible complications include:

  • Rheumatic fever affecting the heart

  • Kidney inflammation

  • Ear infections

  • Sinus infections

  • Pneumonia

  • Abscess around the tonsils

Early antibiotic treatment significantly reduces the risk of these complications.

Prevention

Scarlet fever can be prevented by reducing exposure to group A Streptococcus bacteria and practicing good hygiene.

Preventive measures include:

  • Wash hands frequently with soap and water

  • Avoid sharing utensils, cups, or personal items

  • Cover the mouth and nose when coughing or sneezing

  • Clean frequently touched surfaces regularly

  • Complete the full course of prescribed antibiotics if diagnosed

Prompt medical treatment of strep throat helps prevent the development and spread of scarlet fever.

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