Yes, Chills Are Commonly Seen in Viral Infections
Chills are a well-documented clinical feature of viral respiratory infections, particularly influenza, occurring in 76-100% of older children and adults with influenza. 1
Clinical Evidence from Influenza (The Prototypical Viral Infection)
The strongest guideline evidence comes from British Infection Society/British Thoracic Society pandemic influenza guidelines, which explicitly list chills as a common presenting feature:
- In older children and adults: Chills occur alongside sudden onset of high fever, cough, headache, sore throat, and fatigue 2, 1
- The presentation pattern is characteristic: sudden onset with chills being part of the classic influenza syndrome
- Fever typically settles in 2-4 days, though cough may persist 1-2 weeks 2
Age-Dependent Presentation
The manifestation of chills varies by age group:
- Neonates and infants (<2 years): May present with only fever, without obvious chills, along with non-specific signs like lethargy and poor feeding 2, 1
- Older children and adults: Chills become a prominent feature (76-100% incidence) 1
Beyond Influenza: Other Viral Infections
Recent research confirms chills occur across various viral respiratory infections:
- Community-acquired pneumonia studies show chills in 18.7% of adult patients with various viral pathogens including influenza A, influenza B, RSV, parainfluenza, and adenovirus 3
- Important caveat: Immunosuppressive therapy significantly reduces the incidence of chills in viral infections (p < 0.001), which may mask this symptom in immunocompromised patients 4
Mechanistic Understanding
The chill sensation in viral infections arises from central pyrogenic action rather than actual skin temperature reduction—this has been demonstrated experimentally where subjects developed chills and shivering during fever despite being immersed in neutral-temperature water 5. This explains why chills accompany the fever response to viral infections.
Clinical Pitfall
Do not assume chills automatically indicate bacterial infection. While shaking chills may increase suspicion for bacteremia 6, chills are a normal component of viral infections, especially influenza. The key is evaluating the entire clinical picture rather than relying on chills alone to differentiate viral from bacterial etiology.