Pseudogranuloma inguinale caused by haemophilus ducreyi

Area of Science:

• Microbiology
• Infectious Diseases
• Dermatology

Background:

• Accurate diagnosis of genital ulcers is crucial for effective treatment.
• Haemophilus ducreyi causes chancroid, a sexually transmitted infection.
• Distinguishing chancroid from other ulcerative genital lesions, like granuloma inguinale, can be challenging.

Observation:

• A penile ulcer with the clinical appearance of granuloma inguinale was observed.
• A new selective culture medium was employed for isolating the causative organism.

Findings:

• The new selective culture medium successfully isolated Haemophilus ducreyi in pure culture.
• Definitive diagnosis of Haemophilus ducreyi infection was achieved.
• Antimicrobial susceptibility data was obtained rapidly.
• Therapy was switched from sulfamethoxazole to erythromycin based on susceptibility results.

Implications:

• This selective medium facilitates quicker and more accurate diagnosis of Haemophilus ducreyi.
• Rapid susceptibility testing allows for prompt adjustment of antibiotic regimens.
• Effective treatment leads to faster patient recovery and reduced transmission potential.