Cetrimide Broth is recommended for selective cultivation of Pseudomonas aeruginosa. This medium is the modification of the formula designed by King, Ward and Raney and is useful for the cultivation of P. aeruginosa. This medium is selective as it contains cetrimide (Cetyl trimethyl ammonium bromide), which inhibits other bacteria except P.aeruginosa. is used for the examination of cosmetics and clinical specimens for the presence of P. aeruginosa, as well as for evaluating the efficacy of disinfectants against this organism.