Chancroid is caused by which organism?

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Prepare for the NBME Microbiology Test. Study with flashcards and multiple-choice questions. Each query comes with hints and detailed explanations. Ace your exam!

Multiple Choice

Chancroid is caused by which organism?

Explanation:
Chancroid is caused by Haemophilus ducreyi, a small, fastidious gram-negative coccobacillus that grows best on enriched chocolate agar with special supplements. Clinically, chancroid presents as painful genital ulcers with tender inguinal lymphadenopathy, a combination that helps distinguish it from infections like syphilis, which typically causes a painless chancre, and from gonorrhea or Haemophilus influenzae infections that present with different symptoms. Haemophilus ducreyi is the classic organism associated with chancroid.

Chancroid is caused by Haemophilus ducreyi, a small, fastidious gram-negative coccobacillus that grows best on enriched chocolate agar with special supplements. Clinically, chancroid presents as painful genital ulcers with tender inguinal lymphadenopathy, a combination that helps distinguish it from infections like syphilis, which typically causes a painless chancre, and from gonorrhea or Haemophilus influenzae infections that present with different symptoms. Haemophilus ducreyi is the classic organism associated with chancroid.

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