Rheumatic Fever and Scarlet Fever Management

Diagnostic Approach and Treatment

• The American Heart Association recommends that diagnosis of scarlet fever is clinical, supported by positive throat culture or rapid antigen detection test for Group A Streptococcus (GAS) 1, 2
• The American Academy of Pediatrics suggests that patients with scarlet fever should be treated with immediate antibiotic therapy, such as oral penicillin V: 250 mg twice daily for children, 500 mg 2-3 times daily for adolescents/adults for 10 days, to prevent complications including rheumatic fever 3
• For penicillin-allergic patients with scarlet fever, the Infectious Diseases Society of America recommends erythromycin or first-generation cephalosporins (if no immediate-type hypersensitivity) as alternative treatment options 4
• Patients with scarlet fever are considered non-contagious after 24 hours of antibiotic therapy, as stated by the American Heart Association 3

Rheumatic Fever Management

• The American College of Cardiology recommends that full therapeutic course of penicillin should be given to eradicate residual GAS in patients with rheumatic fever, even if throat culture is negative 5, 6
• Continuous antimicrobial prophylaxis is essential to prevent recurrences of rheumatic fever, with recommended regimens including benzathine penicillin G: 1.2 million units IM every 4 weeks or 600,000 units every 2 weeks, as suggested by the American Heart Association 7, 6
• The American Academy of Pediatrics recommends that the duration of prophylaxis for patients with rheumatic fever should be 10 years or until age 40 (whichever is longer) for those with carditis and residual heart disease, and 10 years or until age 21 (whichever is longer) for those with carditis but no residual heart disease 7, 6

Prevention and Complications

• At least one-third of rheumatic fever cases result from asymptomatic GAS infections, making prevention challenging, as stated by the American Heart Association 1, 2
• Even when scarlet fever/GAS pharyngitis is treated optimally, rheumatic fever can still occur in susceptible individuals, highlighting the importance of continuous prophylaxis, as recommended by the American College of Cardiology 5, 10
• Rheumatic fever can recur even with appropriate treatment, necessitating continuous rather than episodic prophylaxis, as emphasized by the American Heart Association 7, 6