“…The development of VAP begins with the colonization of the dental plaque and oral mucosa by bacterial species such as Staphylococcus aureus, Pseudomonas aeruginosa , and Enterobacteriaceae (Andrews & Steen, 2013; Darvishi Khezri et al, 2014; Haghighi et al, 2017; Kandeel & Tantawy, 2012; Matta, 2015). Host-related factors like advanced age, certain medications, immobilization, supine body positioning, personnel-related factors, and device-related factors like the ventilator circuit and endotracheal tube are the main risk factors of VAP (Andrews & Steen, 2013; Atay & Karabacak, 2014; El-Rabbany, Zaghlol, Bhandari, & Azarpazhooh, 2015; Par et al, 2014; Tuon et al, 2017; Vidal et al, 2017).…”