Diagnostic algorithm
Before prescribing treatment, it is necessary to formulate a detailed clinical diagnosis. For this, the physician must evaluate the severity of the leading syndromes:
- Intoxication syndrome: fever (subfebrile or febrile), fatigue, headache, tachycardia.
- Tonsillar syndrome: marked hyperemia of the mucosa ("flaming fauces") involving the arches, posterior pharyngeal wall, uvula, and soft palate. Tonsils are enlarged, hyperemic, and the tongue is initially heavily coated with white plaque.
- Lymphadenopathic syndrome: enlargement and mild tenderness of the anterior cervical lymph nodes.
- Exanthematous syndrome: pinpoint rash with isolated petechiae on a hyperemic, dry background, with white dermographism.
The diagnosis must reflect the degree of severity (based on symptom severity) and the presence of potential complications (e.g., purulent right-sided otitis media). The results of laboratory tests (throat swab for GABHS, antistreptolysin O titer — e.g., 1/400) should also be indicated.
Management tactics and choice of treatment setting
When determining patient management tactics, the first question to resolve is hospitalization. In typical mild uncomplicated cases, hospitalization is not indicated — treatment is successfully carried out in an outpatient setting (at home).
Comprehensive therapy for scarlet fever includes three directions:
- Etiotropic treatment: aims at destroying GABHS. Beta-lactam antibiotics or macrolides (e.g., klacid 500 mg/day) are prescribed per os. A mandatory condition is that the course duration must be exactly 10 days.
- Pathogenetic treatment: blocks the mechanisms of disease development. Includes the administration of antihistamines (desensitizing agents) such as diazoline.
- Symptomatic treatment: copious fluid intake to relieve intoxication and local therapy (gargling the oropharynx with furatsilin solution or herbal decoctions).
Diagnostic markers for monitoring
During treatment, it is important to monitor pathognomonic symptoms so as not to confuse scarlet fever with a toxic-allergic reaction to antipyretics.
Key signs of the early period:
- Filatov's sign: pale nasolabial triangle, completely free of rash elements.
- Pastia's sign: accentuation of the rash in natural skin folds (axillary, inguinal, cubital).
- «Palm» sign: upon pressure, the rash elements temporarily disappear.
In later stages (the end of the first week and later), when catarrhal phenomena regress, the tongue clears and becomes «raspberry» (with hypertrophy of the papillae). Pastia's sign transitions to the resolution stage, leaving pigmentation in the folds. Characteristic desquamation begins: lamellar desquamation on the nail phalanges of the hands and pityriasis desquamation on the trunk.
Discharge criteria and laboratory control
Patient discharge and permission to attend organized groups (schools, camps) are permitted only after complete clinical recovery, but no earlier than the 12th day of the disease. Following this, the convalescent is subject to dispensary observation for 1 month.
Important aspect: taking a throat swab in scarlet fever is strictly necessary not only to confirm streptococcus, but also for differential diagnosis — to rule out oropharyngeal diphtheria (or diphtheria bacillus carriage). A complete blood count (hemogram) is also a mandatory part of the additional examination plan.
Briefly: answers to topical questions
Which specific antibiotics are the first-line drugs of choice in the treatment of scarlet fever?
In the provided materials on scarlet fever, the drug groups of choice for etiotropic oral treatment are indicated as: macrolides or beta-lactam antibiotics.
The duration of antibacterial therapy for mild uncomplicated cases is 10 days.
Specific names of individual drugs are not listed in the source on scarlet fever treatment.
What early and late complications are most characteristic of scarlet fever?
Complications of scarlet fever are divided into two main groups: early and late.
- Early complications are caused by the septic component and the spread of the pathogen. These include purulent and necrotic lymphadenitis, periadenitis, adenophlegmon, otitis, sinusitis, mastoiditis, and retropharyngeal abscess. In infants under one year of age, they can develop even in mild forms of the disease.
- Late complications are immunopathological (allergic) in nature and develop in the 2nd–3rd week of the disease due to molecular mimicry. They include post-streptococcal glomerulonephritis, myocarditis, endocarditis, and arthritis (synovitis).
What changes in the complete blood count are typical for a bacterial infection in scarlet fever?
The typical complete blood count findings in scarlet fever include:
- Neutrophilic leukocytosis.
- Band neutrophil shift of the leukocyte formula / shift to the left.
- Elevated ESR.
During the convalescence period, leukopenia may be noted.
The triad of pathognomonic skin symptoms is the "FPL" rule: Filatov's sign (pale nasolabial triangle), Pastia's sign (accentuation in folds), "Palm" sign (disappearance upon pressure).
Class and exam questions
Can scarlet fever be treated without hospitalization?
Yes, in mild uncomplicated cases of the disease, hospitalization is not indicated; the patient undergoes outpatient treatment at home.
How many days do antibiotics need to be taken?
Etiotropic therapy with macrolides or beta-lactam antibiotics must be continued strictly for 10 days to completely eradicate the pathogen.
Why is it mandatory to take an oropharyngeal swab?
Taking a throat swab is strictly necessary to rule out oropharyngeal diphtheria or to detect asymptomatic carriage of the diphtheria bacillus.
When can a child return to school after scarlet fever?
Discharge and return to the community are possible only after clinical recovery, but no earlier than the 12th day from the onset of the disease.
What else to study on this topic
- Criteria for assessing the severity of scarlet fever
- Differential diagnosis with toxic-allergic reactions
- Retrospective diagnosis of scarlet fever based on the character of desquamation
- Complications of scarlet fever (purulent otitis media and others)
- Interpretation of serological test results (antistreptolysin O titer)
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