Respiratory Infections — Field Diagnosis and Treatment

Count the respiratory rate by observing chest rise and fall for 60 seconds. Normal adult respiratory rate is 12–20 breaths per minute. A rate above 30 breaths per minute indicates severe respiratory distress requiring immediate intervention. In children, normal rates are slightly higher: 20–30 for ages 5–12, and 30–40 for younger children. Watch for retractions (inward movement of skin at ribs, neck, or abdomen), nasal flaring, or use of accessory muscles. Listen for abnormal sounds: wheezing (obstruction in small airways), stridor (upper airway narrowing), or crackles (fluid in lungs). Assess oxygen saturation if pulse oximetry is available; below 94% is concerning.

Respiratory rate >30, severe retractions, or inability to speak in full sentences indicates severe distress requiring emergency referral.

Viral infections typically present with gradual onset over 1–3 days, prominent runny nose (rhinorrhea), sore throat, mild to moderate cough, and symptoms that improve over 7–10 days. Bacterial infections usually have sudden onset, high fever (often >39°C or 102°F), one-sided symptoms (one-sided sinus pain, one-sided ear pain), colored sputum, and worsening symptoms after initial improvement. However, bacterial superinfection can occur on top of viral illness (e.g., secondary bacterial pneumonia). Viral infections include colds, most cases of acute bronchitis, and many cases of pneumonia. Color of mucus (green or yellow) alone does not reliably indicate bacterial infection; both viral and bacterial infections can produce colored secretions.

Upper respiratory infections are predominantly viral and do not respond to antibiotics. Antiviral medications (like oseltamivir for influenza) have limited effectiveness and are only useful if given within 48 hours of symptom onset. Focus on supportive care: encourage rest, ensure adequate hydration with water, warm fluids, or rehydration salts, and implement steam inhalation 2–3 times daily. Use honey as a demulcent for cough relief (1 tablespoon for adults, age-appropriate amounts for children). Elevate the head for sleeping to reduce nasal congestion. Educate the patient that symptoms typically resolve in 7–10 days. Symptomatic relief includes saline nasal drops or steam, warm compresses for congestion, and throat lozenges if available.

Acute sinusitis is suspected when upper respiratory symptoms persist beyond 10 days, or when symptoms worsen after initial improvement. Key signs include facial pain or pressure (usually unilateral or worse on one side), tenderness over sinuses, and purulent nasal drainage that is green or yellow. Thick, discolored mucus from post-nasal drip may be present. Fever is common. If bacterial sinusitis is strongly suspected (high fever, severe facial pain, prolonged duration), initiate antibiotic therapy. First-line: Amoxicillin 500 mg three times daily for 7–10 days (or Amoxicillin-clavulanate if coverage for beta-lactamase producers is needed). Alternatives for penicillin allergy: Doxycycline 100 mg twice daily or Fluoroquinolone if available. Continue supportive care: saline irrigation, steam inhalation, and elevation of head.

Severe facial swelling, proptosis (eye bulging), or altered vision suggests orbital cellulitis or cavernous sinus thrombosis — refer immediately.

Acute otitis media presents with ear pain (otalgia) and often fever. In children, pulling at the ear, irritability, and decreased appetite are common signs. On examination, the tympanic membrane (eardrum) will appear red, bulging, or with fluid level visible. The condition is more common in children due to horizontal Eustachian tube anatomy. Most cases are viral or viral with secondary bacterial infection. If bacterial infection is suspected (high fever, severe pain, duration >3 days, or child age <2 years), initiate antibiotics. First-line: Amoxicillin — give 500 mg three times daily for adults or 40 mg/kg/day divided into three doses for children. Continue for 7–10 days. Alternative for penicillin allergy: Doxycycline or macrolide. Symptomatic relief: analgesics, warm compress to ear, upright positioning.

Severe pain unresponsive to antibiotics and analgesics, or facial paralysis, suggests mastoiditis or other complications — refer immediately.

Pneumonia is suspected when respiratory infection features include fever, productive cough (bringing up sputum), rapid breathing (respiratory rate >25–30), and chest pain that worsens with breathing or coughing. The patient may appear acutely ill with high fever. Crackles or consolidation sounds may be heard on auscultation (if stethoscope available). Risk factors include age >65, chronic illness, immunosuppression, or hospitalization. Bacterial pneumonia requires antibiotics. First-line: Amoxicillin 500 mg three times daily for typical community-acquired pneumonia, or Doxycycline 100 mg twice daily. For more severe illness or hospitalization: consider fluoroquinolone (Levofloxacin or Moxifloxacin). Treat for 7–14 days depending on severity. Supportive care includes oxygen if available and SpO2 <90%, hydration, rest, and positioning to ease breathing. Monitor for improvement within 48–72 hours.

Respiratory rate >40, SpO2 <90%, confusion, hypotension, or severe chest pain requires emergency referral and possible hospitalization.

Positioning profoundly affects breathing comfort. An upright or semi-reclined position (at least 30–45 degrees) improves air exchange and reduces work of breathing compared to lying flat. This is especially important for pneumonia or severe infections. Steam inhalation 2–3 times daily for 10–15 minutes helps mobilize secretions and reduces bronchospasm and congestion. Have the patient breathe steam from a hot shower, steam from a bowl of hot water, or from a steamer if available. Ensure adequate hydration: encourage patient to drink water, warm broth, or rehydration solution frequently to prevent dehydration and to keep secretions loose. Rest is essential; avoid physical exertion during acute illness. Elevate the head at night using pillows to reduce nocturnal congestion and coughing. Monitor intake and output; inability to maintain hydration may indicate need for IV fluids.

Even in survival or crisis settings, antibiotic stewardship is crucial to prevent resistance. Use antibiotics only when bacterial infection is suspected, not for viral infections. Differentiate viral upper respiratory infections (common cold) from bacterial sinusitis or otitis media. Pneumonia and ear infections with high fever are appropriate for antibiotics. Complete the full prescribed course of antibiotics (7–14 days) even if symptoms improve earlier; stopping early promotes resistance. If no improvement is seen in 48–72 hours on an antibiotic, consider alternative diagnosis or resistance. Track antibiotic availability in your setting and reserve broad-spectrum agents (fluoroquinolones, broad-spectrum combinations) for serious infections. Document clinical reasoning for each antibiotic course. In resource-limited settings, penicillins and doxycycline are effective first-line options for most respiratory infections.

In the context of pandemic illness (such as COVID-19), standard precautions should include isolation of symptomatic individuals from vulnerable populations (elderly, immunocompromised, children). Symptomatic individuals with respiratory infection should wear a mask if available, practice respiratory hygiene (cover cough/sneeze), and maintain 1–2 meters distance. For patients with low oxygen saturation (<94%) or severe respiratory distress, prone positioning (lying face-down) for 12–16 hours daily has shown benefit in improving oxygenation in some critical conditions. Ensure frequent turning and skin monitoring to prevent pressure ulcers. Monitor for deterioration: worsening dyspnea, persistent low oxygen saturation despite positioning, or altered mental status warrant emergency referral if possible. Conserve oxygen supplies; prioritize high-risk patients. Educate contacts about quarantine (typically 10–14 days) and monitor for symptoms. Document symptom onset and illness progression carefully.

SpO2 <88%, severe dyspnea despite positioning, confusion, or shock require intensive care or emergency referral if available.