Isolation of Neisseria gonorrhoeae requires incubation under which condition?

• A. Is enhanced by cold enrichment
• B. Requires incubation under increased CO2
• C. From contaminated sites is made easier by CIN agar
• D. Is not affected if clinical specimen is refrigerated before culturing

Answer: (B)

Neisseria gonorrhoeae is capnophilic, meaning it grows best in a CO2-rich atmosphere. In the lab, incubating specimens on enriched media such as chocolate or Thayer-Martin agar under increased CO2 (typically around 5–10%) promotes optimal growth and clearer colonies, improving isolation from clinical samples. This organism is fastidious and favors these conditions to thrive; without the elevated CO2, recovery is poor and colonies may be difficult to detect. Refrigeration of specimens before culture reduces the organism’s viability, so cold handling does not aid isolation. Cold enrichment and CIN agar are not standard aids for recovering Neisseria gonorrhoeae, which is why increased CO2 is the correct incubation condition.