https://www.selleckchem.com/pr....oducts/chir-99021-ct
At the intubating position, bacteriophage concentrations associated with HFNO (2.66 × 104 plaque-forming units [PFU]/L of air sampled), nasal prongs (1.60 × 104 PFU/L of air sampled), nonrebreather face masks (7.87 × 102 PFU/L of air sampled), and bilevel positive airway pressure (1.91 × 102 PFU/L of air sampled) were significantly higher than those associated with invasive ventilation (P less then 0.05 for each). The difference between bacteriophage concentrations associated with helmet ventilation with a PEEP valve (4
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