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Table 1 Criteria for defining pneumonia

From: Brief summary of French guidelines for the prevention, diagnosis and treatment of hospital-acquired pneumonia in ICU

Radiological signs
 Two successive chest radiographs showing new or progressive lung infiltrates
 In the absence of medical history of underlying heart or lung disease, a single chest radiograph is enough
And at least one of the following signs
 Body temperature > 38,3 °C without any other cause
 Leucocytes < 4000/mm3 or ≥ 12,000/mm3
And at least two of the following signs
 Purulent sputum
 Cough or dyspnoea
 Declining oxygenation or increased oxygen requirement or need for respiratory assistance