Table 2.

Legionnaire's disease: similarities and differences with this case of hMPV pneumonia.

Features in common with LD (mimicking LD)	Features arguing against a diagnosis of LD
•Fever > 102 °F •Relative bradycardiaa •Focal patchy infiltrates (LLL) on CXRb •Increased serum transaminases •Hyponatremia •Hypophosphatemia	•Lymphocytosis •Thrombocytopenia

LD = Legionnaires disease; CXR = chest X-ray; DX = diagnosis.

^aBesides LD, the only CAPs associated with relative bradycardia are Q fever and psittacosis.

^bExcept for adenovirus and rarely HPIV-3 pneumonia, viral pneumonias have minimal/no infiltrates on CXR early, and late may develop bilateral interstitial infiltrates. However, with the aforementioned exceptions viral infiltrates on CXR are never focal/segmental.