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Description

Cetrimide Agar is suitable for selective isolation of Pseudomonas aeruginosa. The use of cetrimide (cetyltrimethylammonium bromide) largely inhibits the growth of the accompanying microbial flora. A concentration of 0.3 g/l of cetrimide inhibits the growth of accompanying organisms satisfactorily and minimizes interference with the growth of P. aeruginosa. The pigment production of P. aeruginosa is not inhibited when grown on this medium. P. aeruginosa can produce different pigments in different combinations. More than 90% of all strains produce the bluish, non-fluorescent pyocyanin, as well as the yellowish, fluorescent pyoverdin (fluorescein). Each settle plate is of 90 mm in diameter, and the packs are single-bagged in transparent, hydrogen peroxide impermeable sleeves (non-irradiated).