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A child has fever, pus on tonsils, tender neck nodes, no cough — streptococcal; penicillin 10 days. Centor criteria (fever, tonsillar exudate, tender anterior nodes, absence of cough) predict strep — rapid antigen confirms; penicillin/amoxicillin 10 days eradicates and prevents rheumatic fever (the reason we treat). Adenoids (children — mouth breathing, snoring, recurrent OM — adenoidectomy if obstructive). Quinsy (peritonsillar abscess — severe unilateral throat pain, trismus — can't open mouth, hot-potato voice, uvula pushed): drain + antibiotics urgently. The no-cough is the clue — cough points viral, its absence points strep.