Diagnostic Approach and Management of Respiratory Infections in Adults

Immediate Clinical Assessment and Diagnostic Considerations

The American Academy of Family Physicians recommends obtaining vital signs immediately, including temperature, heart rate, respiratory rate, and oxygen saturation to assess for respiratory distress, in patients with symptoms of respiratory infection 1
The American College of Physicians suggests performing a focused respiratory examination looking for bilateral or focal crackles on chest auscultation, signs of respiratory distress, and unilateral facial pain or pressure, which may indicate pneumonia or acute bacterial rhinosinusitis 2, 3
The Infectious Diseases Society of America recommends ordering a chest radiograph immediately if any of the following are present: fever >38°C persisting beyond 4 days, pleuritic chest pain, tachycardia or tachypnea, or any respiratory distress 1, 2

The American Thoracic Society suggests that a 5-day duration of symptoms with nightly fevers distinguishes this from typical viral URI, and symptoms persisting beyond 5 days with worsening pattern suggest either acute bacterial rhinosinusitis or community-acquired pneumonia 1, 2, 4
The American Academy of Otolaryngology-Head and Neck Surgery recommends diagnosing acute bacterial rhinosinusitis if purulent nasal discharge plus nasal obstruction or facial pain/pressure are present, and initiating amoxicillin-clavulanate 875/125 mg twice daily for 5-7 days 3, 4
The American College of Chest Physicians recommends initiating empiric antibiotic therapy immediately with amoxicillin-clavulanate 875/125 mg twice daily for 7 days if chest radiograph shows infiltrates, and assessing severity using clinical criteria 2

The American Academy of Family Physicians recommends providing symptomatic treatment, including first-generation antihistamine/decongestant combination, naproxen 220-440 mg twice daily, adequate fluid intake, and honey for cough suppression, if culturally acceptable 1
The American College of Physicians suggests instructing patients to return immediately if worsening dyspnea or respiratory distress develops, fever persists beyond 72 hours of antibiotic therapy, confusion or altered mental status occurs, or hemoptysis increases in volume 1, 2
The Infectious Diseases Society of America recommends scheduling reassessment within 48-72 hours to ensure clinical improvement if managed as outpatient, and reclassifying as subacute cough and reassessing for alternative diagnoses if symptoms persist beyond 3 weeks 2, 5