Common Cold vs. Viral Pharyngitis: Clinical Comparison & Diagnostic Pearls
Table: Common Cold vs. Viral Pharyngitis
| Feature | Common Cold (URI) | Viral Pharyngitis |
|---|---|---|
| Etiology | Rhinovirus, coronavirus, RSV, adenovirus | Adenovirus, EBV, HSV, enterovirus, influenza |
| Primary Site | Nasal mucosa, sinuses, upper airway | Pharyngeal mucosa, lymphoid tissue |
| Onset | Gradual | Gradual or abrupt |
| Fever | May be absent or low-grade (<38.3°C) | Often present, can be high-grade in some viral cases |
| Sore Throat | Mild or absent | Prominent, often painful |
| Cough | Prominent (dry or productive) | Mild or absent unless bronchitis overlaps |
| Rhinorrhea/Nasal Congestion | Common | May or may not be present |
| Tonsils | Normal size, no exudate | Mild/moderate erythema, sometimes petechiae (e.g. EBV) |
| Pharynx | Mildly injected | Marked erythema; vesicles (HSV/herpangina), ulcers |
| Lymphadenopathy | Rare or mild, non-tender | Tender anterior cervical or posterior (EBV) |
| Fatigue/Malaise | Mild | Moderate to severe (EBV, influenza) |
| Red Flags | Rare | Airway compromise, odynophagia, drooling (if severe) |
| Typical Duration | 5–7 days | 3–10 days; EBV may last >2 weeks |
| Antibiotics? | ❌ No | ❌ No, unless secondary bacterial infection is suspected |
| Special Findings | Aphthous-like ulcers in the oropharynx (viral) | Exudate, vesicles, ulcerations (virus-dependent) |
| Complications | Sinusitis, otitis media | Dehydration, airway swelling, splenic rupture (EBV) |
🧠 Clinical Tips to Differentiate
- Runny nose + cough > sore throat? → Think Common Cold
- Severe sore throat + odynophagia + fever? → Think Viral Pharyngitis
- No tonsillar hypertrophy or exudate? → The Common Cold is more likely
- Marked pharyngeal erythema with malaise? → Viral Pharyngitis (e.g., EBV, adenovirus)
- Posterior cervical LN tender? → Think EBV
- Small vesicles/ulcers on the soft palate or tonsils? → Think Herpangina or HSV
📊 CENTOR Criteria: When to Suspect Bacterial Pharyngitis
| Criteria | Points |
|---|---|
| Tonsillar exudates | +1 |
| Tender anterior cervical lymph nodes | +1 |
| Fever >38°C | +1 |
| Absence of cough | +1 |
Interpretation:
- 0–1 point: No testing or antibiotics
- 2–3 points: Consider rapid strep test or backup culture
- ≥3 points: Consider empiric antibiotics or a test-and-treat strategy
📍Why Use CENTOR Score?
- The CENTOR score is a clinical prediction rule designed to estimate the likelihood of Group A β-hemolytic Streptococcus (GAS) pharyngitis.
- It helps avoid unnecessary antibiotic use in patients unlikely to have streptococcal infection.
- In contrast to viral causes, GAS pharyngitis often shows:
- Sudden onset of sore throat
- High fever
- Tonsillar exudates
- Tender anterior cervical adenopathy
- No cough