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Typical vs Atypical Pneumonia: Key DifferencesTypical PneumoniaCausative agents:%u2022Streptococcus pneumoniae%u2022Haemophilus influenzae%u2022Staphylococcus aureusClinical features:%u2022Acute onset%u2022High fever (>38%u00b0C)%u2022Productive cough with purulent sputum%u2022Pleuritic chest pain%u2022Lobar consolidation on chest X-rayLaboratory findings:%u2022Elevated white blood cell count%u2022Positive Gram stain of sputumAtypical PneumoniaCausative agents:%u2022Mycoplasma pneumoniae%u2022Legionella pneumophila%u2022Chlamydophila pneumoniaeClinical features:%u2022Gradual onset%u2022Low-grade fever%u2022Dry, non-productive cough%u2022Extra-pulmonary symptoms (headache, myalgia)%u2022Patchy or interstitial infiltrates on chest X-rayLaboratory findings:%u2022Normal or slightly elevated white blood cell count%u2022Negative Gram stain of sputumKey Points:Typical pneumonia tends to have a more severe presentation with localized symptoms.Atypical pneumonia often has a more insidious onset with systemic symptoms.X-ray findings differ lobar in typical, patchy in atypical.Treatment may vary beta-lactams for typical, macrolides or fluoroquinolones for atypical.Atypical pneumonia is more common in younger adults.