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Physiopathological approach of progression of nosocomial pneumonia from wards to ICU. From green to red colour, the progression of the severity of nosocomial pneumonia is described independently of the area of hospital admission. vHAP shows the poorest outcome. HAP, hospital-acquired pneumonia; NV-ICUAP, non-ventilated acquired pneumonia; VAP, ventilator-acquired pneumonia; vHAP, ventilated hospital-acquired pneumonia
