In epidemiologic surveys for upper respiratory tract carriers of Neisseria meningitidis or Bordetella pertussis, what is the optimal specimen type for culture?

In epidemiologic surveys for upper respiratory tract carriers of Neisseria meningitidis or Bordetella pertussis, what is the optimal specimen type for culture?

• A. Anterior nares
• B. Buccal cavity
• C. Nasopharyngeal
• D. Throat

Answer: (C)

The main idea is that detecting carriage by culture works best when you sample from the site where the organism predominantly lives. Neisseria meningitidis and Bordetella pertussis primarily colonize the nasopharyngeal mucosa, so a nasopharyngeal specimen yields the highest culture positivity. Samples from the anterior nares, buccal cavity, or throat are less reliable for these pathogens because those sites harbor little or inconsistent amounts of the organisms, leading to lower sensitivity. Using a nasopharyngeal swab or aspirate with proper transport preserves viability and maximizes recovery, making it the optimal choice for epidemiologic surveys of upper respiratory tract carriers.

The main idea is that detecting carriage by culture works best when you sample from the site where the organism predominantly lives. Neisseria meningitidis and Bordetella pertussis primarily colonize the nasopharyngeal mucosa, so a nasopharyngeal specimen yields the highest culture positivity. Samples from the anterior nares, buccal cavity, or throat are less reliable for these pathogens because those sites harbor little or inconsistent amounts of the organisms, leading to lower sensitivity. Using a nasopharyngeal swab or aspirate with proper transport preserves viability and maximizes recovery, making it the optimal choice for epidemiologic surveys of upper respiratory tract carriers.