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Scarlet Fever Symptoms – Rash, Fever & Signs
Scarlet fever is a bacterial infection causing sore throat, high fever, and a distinctive red rash. Learn how to recognize the key symptoms of scarlet fever in children and adults.
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Scarlet fever is a bacterial infection causing sore throat, high fever, and a distinctive red rash. Learn how to recognize the key symptoms of scarlet fever in children and adults.
What is Scarlet Fever?
Scarlet fever is a contagious bacterial infection caused by Group A Streptococcus (Streptococcus pyogenes). It most commonly affects children between the ages of 5 and 15, though adults can also be infected. The condition is highly recognizable due to its distinctive combination of symptoms and responds well to antibiotic treatment.
Key Symptoms of Scarlet Fever
Symptoms typically appear 2 to 5 days after exposure to the bacteria and can develop rapidly. The most characteristic signs include:
Early Symptoms
- Sudden high fever (often above 39 °C / 102 °F)
- Severe sore throat and difficulty swallowing
- Headache
- Nausea and vomiting, especially in children
- Stomach pain
The Characteristic Scarlet Fever Rash
One of the most recognizable features of scarlet fever is the scarlatiniform rash, which usually appears 12 to 48 hours after the onset of illness:
- Fine, red, sandpaper-like rash covering large areas of the body
- Typically begins in the groin or armpits and spreads to the trunk and limbs
- The face appears flushed, while the area around the mouth remains pale (known as circumoral pallor)
- Dark red lines may appear in skin folds such as the inner elbow (known as Pastia lines)
Changes in the Mouth and Throat
- Strawberry tongue: Initially coated white, then turning bright red and swollen
- Red, inflamed throat and tonsils, often with a white or yellow coating
- Swollen lymph nodes in the neck
Additional Symptoms
- General feeling of illness and fatigue
- Skin peeling on the palms and soles of the feet after the rash fades
Causes and Transmission
Scarlet fever is caused by Group A Streptococcal bacteria, which produce a specific toxin (erythrogenic toxin) responsible for the characteristic rash. The infection spreads primarily through droplet transmission -- via coughing, sneezing, or close contact with an infected person. Less commonly, it can be transmitted through contaminated surfaces or food.
Diagnosis
Diagnosis is typically made by a doctor based on the clinical presentation. To confirm the diagnosis, the following tests may be used:
- Throat swab: A rapid antigen test or laboratory culture can identify the Streptococcal bacteria
- Blood tests: Elevated inflammatory markers (CRP) and increased Streptococcal antibody levels (ASO titer)
Treatment
Scarlet fever is treated with antibiotics, most commonly penicillin or, in cases of allergy, amoxicillin or erythromycin. A full course of antibiotics -- typically 10 days -- is essential to prevent serious complications such as:
- Rheumatic fever
- Post-streptococcal glomerulonephritis (kidney inflammation)
- Middle ear infection (otitis media)
Supportive care includes rest, adequate fluid intake, and fever-reducing medications such as ibuprofen or paracetamol. After 24 hours of antibiotic therapy, the patient is generally no longer contagious.
When to See a Doctor
If scarlet fever is suspected -- particularly in a child with high fever, severe sore throat, and a distinctive rash -- medical attention should be sought promptly. Without treatment, scarlet fever can lead to serious complications affecting the heart, kidneys, and joints.
References
- World Health Organization (WHO): Streptococcal diseases. Available at: https://www.who.int
- Centers for Disease Control and Prevention (CDC): Scarlet Fever: A Group A Streptococcal Infection. Available at: https://www.cdc.gov
- Robert Koch-Institut (RKI): Epidemiological information on scarlet fever (Scharlach), 2023. Available at: https://www.rki.de
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