What media are selected for cerebrospinal fluid cultures to optimize growth of typical pathogens?

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Multiple Choice

What media are selected for cerebrospinal fluid cultures to optimize growth of typical pathogens?

Culturing cerebrospinal fluid to find typical meningitis pathogens relies on using enriched, fastidious-friendly media and the right atmosphere. Chocolate agar provides the X and V factors that Haemophilus influenzae requires, and in a CO2-enriched environment Neisseria meningitidis grows well. Blood agar serves as a broad, nonselective medium that supports growth of many organisms, including Streptococcus pneumoniae and other common CSF pathogens. Incubating both media for a couple of days (about 72 hours) gives slower growers like Listeria monocytogenes time to appear. Together, these media in CO2 maximize the chance of recovering the usual CSF pathogens. Other media are less suited: MacConkey is selective for many Gram-negative enterics and can inhibit some fastidious CSF organisms; CIN is tailored for Yersinia and isn’t primary for routine CSF pathogens; relying on a single medium or non-CO2 conditions can miss fastidious organisms that require enriched environments.

Culturing cerebrospinal fluid to find typical meningitis pathogens relies on using enriched, fastidious-friendly media and the right atmosphere. Chocolate agar provides the X and V factors that Haemophilus influenzae requires, and in a CO2-enriched environment Neisseria meningitidis grows well. Blood agar serves as a broad, nonselective medium that supports growth of many organisms, including Streptococcus pneumoniae and other common CSF pathogens. Incubating both media for a couple of days (about 72 hours) gives slower growers like Listeria monocytogenes time to appear. Together, these media in CO2 maximize the chance of recovering the usual CSF pathogens.

Other media are less suited: MacConkey is selective for many Gram-negative enterics and can inhibit some fastidious CSF organisms; CIN is tailored for Yersinia and isn’t primary for routine CSF pathogens; relying on a single medium or non-CO2 conditions can miss fastidious organisms that require enriched environments.

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