Australia's national clinical practice guidelines recommend intramuscular (IM) penicillin every 28 days for persons diagnosed with an initial episode of acute rheumatic fever (ARF). This antibiotic coverage is initiated to reduce recurrent ARF episodes by preventing repeat infections with the causative bacterium, group A Streptococcus. Because disease has already occurred, this regimen is known as secondary prophylaxis (SP), done in order to prevent more episodes of ARF (known as recurrences).
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