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Algorithm for determining the microbiological cause of hospital-acquired pneumonia (HAP) and ventilator-associated pneumonia (VAP) using risk factors for resistance and severity of illness. MRSA Methicillin-resistant Staphylococcus aureus; MSSA Methicillin-sensitive S aureus. Data are from references 2,11,40,44–91, and represent level A-2 data
