In a healthy 23‑year‑old woman with a red throat, small uvular ulceration, severe sore throat, mild edema, and no fever, malaise, myalgia, or airway compromise, could the circulating enterovirus (including non‑specific enterovirus and EV‑D68) or adenovirus be the etiology, and what other causes should be considered?

Viral Pharyngitis with Uvular Ulceration: Enterovirus is the Most Likely Culprit

Yes, enterovirus (including non-specific enterovirus and potentially EV-D68) is highly consistent with this presentation and represents the most likely etiology among the circulating viruses you mentioned. The combination of pharyngeal erythema, uvular ulceration, severe throat pain, absence of systemic symptoms, and the patient's age profile strongly suggests a viral pharyngitis, with enterovirus being particularly characteristic 1, 2.

Why Enterovirus Fits Best

The clinical presentation you describe—oral ulcers on the uvula with significant throat pain but no fever, malaise, or myalgia—is a classic viral signature that argues strongly against Group A Streptococcus (GAS). According to IDSA guidelines, oral ulcers are highly suggestive of viral etiology and testing for GAS is not recommended when these features are present 2, 1.

Specifically:

• Enteroviruses (including coxsackievirus and echoviruses) are well-documented causes of pharyngitis with characteristic oral lesions 2, 3
• The absence of fever, cough, rhinorrhea, and constitutional symptoms makes this presentation atypical for most respiratory viruses but consistent with localized enteroviral pharyngitis
• Enterovirus D68 (EV-D68), while more commonly associated with respiratory symptoms, can present with pharyngitis 4, 5, 6

Adenovirus: A Reasonable Alternative

Adenovirus is also a plausible cause, as it frequently causes acute pharyngitis 7, 1, 2. However, adenovirus typically presents with:

• More prominent conjunctivitis
• Systemic symptoms (fever, malaise)
• Tonsillopharyngeal exudates rather than discrete ulcers

The absence of these features and the presence of uvular ulceration make enterovirus more likely than adenovirus in this case.

What About EV-D68 Specifically?

While EV-D68 is primarily recognized for causing respiratory illness (cough, dyspnea, wheezing) 4, 5, 8, 6, it can cause pharyngitis. Recent data show:

• EV-D68 in adults presents predominantly with respiratory symptoms (cough 74%, dyspnea 70%) rather than isolated pharyngitis 4
• When EV-D68 causes pharyngitis, it tends to occur with respiratory symptoms and in patients with underlying chronic respiratory disease 5, 6

Your patient's lack of respiratory symptoms and systemic illness makes non-D68 enterovirus (such as coxsackievirus or echovirus) more likely than EV-D68, though EV-D68 cannot be completely excluded.

Other Diagnostic Considerations

Herpes Simplex Virus (HSV)

HSV should be strongly considered as it causes pharyngitis with characteristic vesicles and ulcers, particularly on the soft palate and uvula 2, 3. The severe throat pain is consistent with herpetic pharyngitis. This is a critical differential that warrants consideration, especially in young adults.

Group C or G Streptococcus

These can cause pharyngitis in young adults 2, but:

• They typically present with more systemic symptoms
• There is no convincing evidence that antibiotic therapy improves outcomes 2
• Testing is not routinely recommended

Fusobacterium necrophorum

In a 23-year-old woman with severe pharyngitis, F. necrophorum deserves mention as it causes approximately 10-20% of endemic pharyngitis in adolescents and young adults 7, 2. However:

• The absence of severe systemic symptoms, neck tenderness, or difficulty swallowing makes Lemierre syndrome unlikely
• Routine testing is not recommended 2
• Remain vigilant for progression to severe illness requiring urgent treatment 7

Clinical Management Algorithm

Do NOT test for GAS in this patient. The presence of oral ulcers is a strong indicator of viral etiology, and IDSA guidelines explicitly state that testing is not recommended when obvious viral features are present 2, 1, 2.

Recommended approach:

1. Provide symptomatic treatment only (analgesics, hydration)
2. No antibiotics are indicated unless the clinical picture changes
3. Counsel the patient that this is likely a self-limited viral illness
4. Arrange close follow-up or instruct the patient to return immediately if:
   • Severe worsening of throat pain
   • Difficulty swallowing or drooling develops
   • Neck swelling or tenderness appears
   • Systemic symptoms emerge (high fever, rigors)
   • Respiratory symptoms develop

If you must confirm the diagnosis:

• Viral PCR testing of throat swab can identify enterovirus, adenovirus, or HSV
• This is generally not necessary for clinical management but may be useful for epidemiological tracking given the circulating viruses in your area

Key Pitfalls to Avoid

• Do not prescribe antibiotics based on the severity of throat pain alone—this is a viral presentation 2, 7
• Do not miss Lemierre syndrome in young adults with severe pharyngitis—maintain a low threshold for re-evaluation if symptoms worsen 7, 2
• Do not overlook HSV pharyngitis, which can cause severe pain and ulceration and may benefit from antiviral therapy in severe cases
• Be aware that EV-D68 can progress to respiratory failure in patients with underlying respiratory disease, though this patient currently has no respiratory symptoms 4, 8, 6