= Solution
\b[Treat <scarlet fever> as an infectious illness, support fluid and food intake, and distinguish local suppuration, invasive infection and delayed immune complications.] The severity of the throat disease and the general condition matter more than the brilliance of the rash.
In 1866, reasonable supportive care meant separation from susceptible contacts, attentive nursing, a comfortable ventilated room, rest and food and fluids that could be swallowed. Severe throat pain, difficulty swallowing, increasing neck swelling, breathing difficulty, marked prostration or altered awareness required repeated examination. Convalescence also needed observation of the <urine> and swelling. Historical attempts to drive out a rash by excessive heat, aggressive purging or stimulants did not establish a way to remove the cause. Renal complications after apparently successful recovery were already recognized: a contemporary digest discusses delayed <albuminuria> after the apparent convalescence from <scarlet fever>.<Half-yearly abstract of the medical sciences (July–December 1866)>[Section on albuminuria during convalescence from scarlet fever and other eruptive diseases; report of 29 September 1866]{ref}
\b[Modern correction: <scarlet fever> is associated with toxin-producing group A <streptococcal infection>, and appropriate testing and <antibiotic> treatment replace supposed rash-specific remedies.] A compatible illness may be confirmed by a rapid antigen test, molecular test or throat <microbiological culture>. <Penicillin> or <amoxicillin> is a usual treatment for confirmed disease; allergy and local resistance affect alternatives. Supportive fluid intake and appropriate relief of pain remain useful. Infection-control measures and the applicable exclusion interval after treatment reduce transmission.<Clinical Guidance for Scarlet Fever by CDC>[Testing and diagnosis; Treatment; Prevention]{ref}
The complications require different responses. <Otitis media>, cervical <lymphadenitis> and a <peritonsillar abscess> or <retropharyngeal abscess> result from spread of <infection>. New focal pain or swelling calls for examination; an <abscess> may require drainage as well as <antibiotics>. Airway compromise, profound illness or signs of <sepsis> require urgent hospital care, rather than simply changing a gargle. These complications are distinct from <acute rheumatic fever> and <post-streptococcal glomerulonephritis>, which arise through the response to the preceding <infection>.<Clinical Guidance for Scarlet Fever by CDC>[Complications, suppurative complications and nonsuppurative sequelae]{ref}
For the renal complication, look for dark or scanty <urine>, <haematuria>, <oedema> and <hypertension>, including after the throat and rash have improved. Assess <kidney> function and fluid balance. Treatment addresses <hypertension> and fluid excess; severe renal complications require specialist management. <Antibiotics> eradicate persisting group A <streptococcal infection> and reduce its spread, but are not proved to prevent every case of <post-streptococcal glomerulonephritis>. When <acute rheumatic fever> occurs, assess for <carditis>, treat the inflammatory manifestations and any <heart failure>, eradicate residual <streptococcal infection> and arrange appropriate secondary <antibiotic prophylaxis>. Prevention must not be reduced to waiting for swollen <anatomical joints> or obvious heart disease.<Clinical Guidelines for Post-Streptococcal Glomerulonephritis by CDC>[Clinical features; Treatment; Prevention, insufficient evidence for antimicrobial prevention of PSGN]{ref}<Clinical Guidance for Acute Rheumatic Fever by CDC>[Manifestations, subclinical carditis and prevention]{ref} Thus “counteracting the complications” means identifying the actual process and its consequences, not applying one remedy to every late symptom.
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