Cengage Microbiology Practice Test

If a dual swab system is used for a throat culture, the second swab is used for which purpose?

Performing a throat culture Gram staining Antibiotic susceptibility testing Storing for transport

Correct Answer:

Performing a throat culture

Explanation:

Using two swabs for throat collection lets labs separate material for culture from other testing. The second swab is reserved to inoculate culture media so the organism can be grown and identified. This approach ensures there’s a dedicated, viable sample specifically for culture, improving the chances of recovering pathogens like group A Streptococcus. Gram staining is a separate step done on a smear, and antibiotic susceptibility testing requires organisms to be grown first, so they aren’t performed directly from the swab used for culture. Storing for transport is typically handled by the transport medium rather than the culture swab.

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