Final answer:
The treatment for acute rheumatic fever, which follows untreated streptococcal pharyngitis, is antibiotics to address the bacterial infection.
Step-by-step explanation:
Acute rheumatic fever is a sequela of untreated or inadequately treated streptococcal pharyngitis, and it can lead to serious complications such as rheumatic heart disease. The common treatment for rheumatic fever is antibiotics to eradicate the underlying streptococcal infection. Although options such as antivirals, antipyretics, and antifungals are used in different contexts, they are not effective in treating the bacterial cause of rheumatic fever. Prompt antibiotic treatment, especially with medications like penicillin, is key to prevent the progression of the disease and the development of cardiac comorbidities.