Viral Infections and Nasal Discharge Characteristics

Introduction to Viral Infections

Viral upper respiratory infections typically begin with clear, watery nasal discharge that evolves over the course of the illness, according to the American Academy of Otolaryngology-Head and Neck Surgery 1, 3
The American Academy of Pediatrics notes that as the infection progresses, nasal discharge naturally becomes thicker and more mucoid, eventually becoming purulent for several days 4, 5

The American Academy of Otolaryngology-Head and Neck Surgery states that the change in appearance of nasal discharge is due to the influx of neutrophils and desquamated epithelium, not necessarily indicating bacterial infection 1, 2
The American Academy of Pediatrics reports that most uncomplicated viral URIs last 5-7 days, with respiratory symptoms peaking between days 3-6 4

The American College of Physicians recommends that bacterial sinusitis should be suspected when symptoms persist without improvement for >10 days, or when there is high fever with purulent nasal discharge for at least 3 consecutive days, or when symptoms worsen after initial improvement 6, 5
The American Academy of Otolaryngology-Head and Neck Surgery advises that antibiotics should not be prescribed for viral infections with purulent nasal discharge 6
The American College of Physicians suggests that supportive care is the appropriate management for most patients with viral rhinosinusitis 6

The American Academy of Otolaryngology-Head and Neck Surgery warns against assuming bacterial infection based solely on white or colored nasal discharge 1, 4
The American College of Physicians recommends against prescribing antibiotics for purulent nasal discharge without other signs of bacterial infection 6