1. Lab. No. 4 A

3. Neisseria The most important species are: N.Gonorrhoeae & N.meningitidis. Morphology (microscopical examination): Morphology (microscopical examination): Gram –ve cocci arranged in pairs (diplococci) with adjacent sides flattened → kidney shaped ( coffee bean shaped). Nonmotile, nonsporeforming. is capsulated. N.meningitidis is capsulated.

4. N.gonorrhoeae CultureN.gonorrhoeae smear

5. Culture media: Culture media: Neisseria species are fastidious in their growth requirments.  Modified chocolate agar (enriched selective medium).  Contains several antibiotics to inhibit the growth of endogenous flora.

6. Biochemical recations: Biochemical recations: All species are oxidase positive and catalase positive. All species are oxidase positive and catalase positive.