A 1.25% solution of acetic acid has been shown to be an effective bactericidal agent against:

a. Staphylococcus au-reus c. Micobacterium tu-berculosis
b. Pseudomonas aeru-ginosa d. Streptococcus pneumoniae

ANS: B
Pseudomonas aeruginosa is killed by 1.25% acetic acid or one part 5% white household vinegar and three parts water. Pseudomonas aeruginosa transmission is through indirect contact via fom-ites, such as those on clothing, surgical bandages, and especially equipment. It is the most com-mon respiratory pathogen in patients with cystic fibrosis and is encountered in patients with chronic obstructive pulmonary disease.