Multicenter observational retrospective cohort study aiming at comparing the incidence of ventilator-associated lower respiratory tract infections between COVID-19 patients from the first and the second wave of the pandemic.
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Cumulative incidence of ventilator-associated lower respiratory tract infection (ventilator-associated pneumonia and ventilator associated tracheobronchitis)
Timeframe: from day 3 of mechanical ventilation to extubation or day 28 post-intubation