Nosocomial infection is predominant in every hospital. The distribution of bacteria is vary all over the world and it follows the preventive strategies of that hospital. Therefore we cant conclude that P. aeruginosa come first in rank but it is among the common nosocomial pathogens. you see this article and see that S. aureus is more predominant than P. aeruginosa
Nosocomial infections in burn patients: etiology, antimicrobial resistance, means to control
Pseudomonas aeruginosa is the most important opportunistic pathogen seen in nosocomial infections, especially in burn infections. Besides, cystic fibrosis patients and urinary tract infections are also present. Given that it has high antibiotic resistance, it is very important in this regard.