1. Protocol criteria for HAP/VAP: Criteria for making a correct diagnosis of HAP will be met if the patient develops a new or progressive pulmonary infiltrate associated with at least two of the following: new or increased respiratory symptomatology (cough, sputum or tracheal secretions, shortness of breath), fever or hypothermia, leukocytosis, left shift, or leukopenia, or deterioration of pulmonary function.