The primary objective of this study is to assess the incidence of VAP in patients with TBI and to identify risk factors for developing VAP in this specific patient population (types of co-injuries in patients with multiple trauma or characteristics on admission). The secondary objective is to assess the prevalence of pathogens responsible for early- and late-onset VAP in patients with TBI. The tertiary objective is to discuss the ability of preventive measures to reduce the incidence of VAP