H. aegyptius and H. ducreyi
H. ducreyi
Morphology
- Short, Gram-negative, nonmotile rods
- Saftey pin appreance
Culture
- Difficult to culture and require special mediums.
Clinical Manifestations
Chancroid
- Causes ulcus molle (soft chancre) a tropical venereal disease .
- Painful, soft ulcers with ragged undermined margins develop 1–2 weeks after inoculation (usually seen in prepuce and frenulum in men and vulva, cervix, and perianal area in women)

- The infection locus presents as a painful, readily bleeding ulcer occurring mainly in the genital area.
- Regional lymph nodes are quite swollen.
- Suppurating buboes seen
Diagnosis
- Identification of the pathogen by means of microscopy and culturing are needed to confirm the diagnosis.
- School of fish appearance or rail road track appearance

Treatment
Sulfonamides, streptomycin, and tetracyclines.
H. aegyptius (possibly identical with biovar III of Haemophilus influenzae)
- Causes a purulent conjunctivitis occurring mainly in northern Africa, in particular Egypt.
- A raised incidence of Brazilian purpuric fever, a systemic infection with this organism, has been observed in Brazil in recent years.
Exam Important
H. ducreyi
Morphology
- Saftey pin appreance
Clinical Manifestations
Chancroid
- Causes ulcus molle (soft chancre) a tropical venereal disease .
- Painful, soft ulcers with ragged undermined margins develop 1–2 weeks after inoculation (usually seen in prepuce and frenulum in men and vulva, cervix, and perianal area in women)
- The infection locus presents as a painful, readily bleeding ulcer occurring mainly in the genital area.
- Regional lymph nodes are quite swollen.
- Suppurating buboes seen
Diagnosis
- Identification of the pathogen by means of microscopy and culturing are needed to confirm the diagnosis.
- School of fish appearance or rail road track appearance
H. aegyptius (possibly identical with biovar III of Haemophilus influenzae)
- Causes a purulent conjunctivitis occurring mainly in northern Africa, in particular Egypt.
Don’t Forget to Solve all the previous Year Question asked on H. aegyptius and H. ducreyi
Click Here to Start Quiz
Click Here to Start Quiz


