Acute rheumatic fever

Area of Science:

• Infectious Diseases
• Immunology
• Epidemiology

Background:

• Rheumatic fever was a prevalent disease with substantial morbidity and mortality in the U.S. during the early 20th century.
• Renewed outbreaks in the 1980s highlighted that rheumatic fever was not eradicated and remained a significant public health concern.

Purpose of the Study:

• To review the current understanding of rheumatic fever's epidemiology, etiology, and clinical aspects.
• To emphasize the need for physicians to maintain awareness of rheumatic fever as a diagnostic possibility.

Main Methods:

• Review of existing literature on rheumatic fever's historical prevalence, recent outbreaks, and potential contributing factors.
• Discussion of the role of environmental, genetic, and microbial factors, specifically group A streptococcus strains and their proteins.
• Examination of proposed mechanisms of disease, including molecular mimicry and immune modulation by streptococci.

Main Results:

• While the exact etiology remains elusive, environmental and genetic factors are recognized as significant in rheumatic fever's epidemiology.
• Group A streptococcus, the implicated organism, exhibits strain variability, with protein differences potentially influencing its capacity to cause rheumatic fever.
• Evidence suggests streptococci contribute antigens that cross-react with human tissues and can alter immune responses, contributing to disease pathogenesis.

Conclusions:

• Rheumatic fever persists as a relevant clinical diagnosis, necessitating ongoing vigilance.
• Further research into the complex interplay of host factors and specific group A streptococcus characteristics is crucial for understanding and preventing rheumatic fever.