Fever (55.1% vs. 14.2%, p < 0.001), elevation of white blood cell count (34.8% vs. 20.1%, p = 0.004), and elevation of C-reactive protein level (69.1% vs. 41.8%, p < 0.001) were more commonly observed in patients with infectious pneumonia than those with pneumonic-type IMA. The gene discussed is CRP; the disease is Fever.