A large hospital washes burn patients in a stainless steel tub. After each patient, the tub is cleaned with a quat. It was noticed that 14-20 burn patients acquired Pseudomonas infections after being...

A large hospital washes burn patients in a stainless steel tub. After each patient, the tub is cleaned with a quat. It was noticed that 14-20 burn patients acquired Pseudomonas infections after being bathed. Provide an explanation for this high rate of infection.