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What is scarlet fever?
Scarlet fever (also termed scarlatina) is an illness characterized by a bright red rash that can cover most of the body and is caused by a toxin secreted by group A streptococci, a type of gram-positive coccus-shaped (round) bacteria. Scarlet fever usually occurs in individuals that have had a strep throat infection or occasionally in those who have had streptococcal skin infection. The majority of people who get scarlet fever are between about 5-12 years of age. (It rarely occurs in babies under 2 years of age.)
Is scarlet fever contagious?
Scarlet fever may be contagious if a person becomes infected with a group A streptococcal bacterial strain that produces the scarlet fever toxin. However, not all people who get group A streptococcal infections develop scarlet fever; only a small percentage of these patients go on to develop scarlet fever.
How will I know if I have scarlet fever?
Individuals with scarlet fever usually have some or most of the following symptoms and signs:
- Red rash with a sandpaper feel when touched
- Fever above 101 F
- Red, sore throat
- A "strawberry-like" appearance of the tongue
- Headache, body aches
- Nausea and/or vomiting
- Enlarged lymph nodes
- Some individuals may have whitish coating on the tongue and/or back of the throat
The red rash may develop later than other symptoms (up to about seven days later). The physician can give a clinical diagnosis from the patient's history, physical exam, and possibly a rapid strep test; in some individuals, a throat culture may be done to determine if group A strep is the infecting bacteria.
How is scarlet fever transmitted?
The bacterial infection (strep throat or skin infection) that results in scarlet fever is contagious, but some people will get the infection (such as strep throat) without going on to develop scarlet fever. Consequently, scarlet fever spread is the secondary result of the way most group A streptococcal infections are spread -- by direct person-to-person contact (kissing, touching mucus membranes, for example) and by indirect methods such as contaminated eating utensils, cups, and other objects used by infected individuals. However, not all individuals who get group A streptococcal infections will develop scarlet fever.
When will I know I am cured of scarlet fever?
Scarlet fever can be treated with antibiotics because once the streptococci bacteria are debilitated or killed, they stop producing toxin and the rash will slowly fade away. A medical caregiver can help diagnose scarlet fever by doing a simple strep test or, if indicated, can culture the throat to confirm a group A streptococcal infection. Individuals with scarlet fever need to be treated quickly with antibiotics to reduce the chance of developing long-term health problems such as rheumatic fever, kidney disease, ear infections, and other types of infections.
When should I contact a physician about scarlet fever?
An individual should see a medical caregiver if they have had a recent infection of strep throat and then develop the symptoms of scarlet fever (especially a reddish rash on the body). It's important to have a physician evaluate the patient to be sure that appropriate diagnosis and treatment (antibiotics) take place quickly to avoid or reduce the chances of any of the complications of scarlet fever such as organ impairment (of the kidneys, heart, joints, for example).
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"Scarlet Fever: A Group A Streptococcal Infection." Centers for Disease Control and Prevention. Jan. 19, 2016.
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