Assessment of a 23-Year-Old Woman with Sore Throat
Begin with clinical evaluation using the Centor criteria to determine if testing for Group A Streptococcus (GAS) is warranted, and only proceed with throat swab testing if viral features are absent. 1
Initial Clinical Assessment
Start by evaluating for viral features that make GAS unlikely. If the patient has cough, rhinorrhea, hoarseness, or oral ulcers, testing for GAS is not recommended as these strongly suggest viral etiology 1. Most sore throats in adults are viral—only about 10% are due to GAS 2.
Risk Stratification Using Clinical Criteria
Apply the Centor criteria to assess GAS probability 1, 3:
- Fever >38°C (or subjective fever)
- Tonsillar exudate
- Tender anterior cervical lymphadenopathy
- Absence of cough
Scoring and Management Algorithm:
- 0-1 points: Do not test or treat with antibiotics 4
- 2-3 points: Perform rapid antigen detection test (RADT) or throat culture; treat only if positive 1
- 4 points: Consider immediate testing with RADT; antibiotics may be started based on positive result 1
Additional Clinical Features to Assess
Beyond Centor criteria, evaluate:
- Patient's subjective assessment of severity (significantly predictive) 5
- Physician assessment of tonsillar inflammation severity 5
- Muscle aches (moderately bad or worse suggests streptococcal infection) 5
- Duration of symptoms (if >7 days in this age group, consider infectious mononucleosis) 6
- General appearance and systemic illness severity 6
Laboratory Testing Strategy
For adults with 2-4 Centor points: Perform RADT 1. The key difference from pediatric management is that backup throat culture after negative RADT is NOT routinely necessary in adults due to low GAS incidence and exceptionally low risk of acute rheumatic fever 1. However, if you want maximum diagnostic sensitivity, backup culture remains an option 1.
Important caveat: Do not test asymptomatic contacts 1, and anti-streptococcal antibody titers are not useful for acute diagnosis 1.
What NOT to Do
- Do not empirically prescribe antibiotics without clinical assessment or testing (60% of adults with sore throat receive antibiotics despite only 10% having GAS) 2
- Do not test if strong viral features present 1
- Do not perform routine follow-up testing after treatment 1
Special Consideration for This Age Group
In a 23-year-old with prolonged symptoms (>7 days), consider infectious mononucleosis and verify with IgM testing for Epstein-Barr virus 6, 7.
The assessment is straightforward: clinical scoring drives the decision to test, and testing drives the decision to treat. This approach reduces unnecessary antibiotic use while identifying the minority of patients who truly need treatment.