Production of 14C-labeled gas in BACTEC Neisseria Differentiation kits by Neisseria cinerea

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Abstract
Six strains of N. cinerea were tested in BACTEC Neisseria Differentiation kits, and all yielded positive glucose growth indices and negative maltose and fructose growth indices. These results were similar to those achieved with N. gonorrhoeae. However, most of the N. cinerea isolates tested yielded 3-h glucose growth indices that were lower than those obtained with gonococci. 14C-labeled gas was produced significantly faster (P < 0.02) by N. gonorrhoeae than by N. cinerea. Additional studies suggested that the 14C-labeled gas produced by N. cinerea CO2. N. cinerea strains were similar to Branhamella catarrhalis strains because both species failed to produce detectable acid from glucose, maltose, sucrose, fructose, and lactose in cysteine-tryptic agar media. However, in contrast to N. cinerea strains, B. catarrhalis strains did not metabolize glucose in BACTEC Neisseria Differentiation kits.