Haemophilus ducreyi

Question 1

Describe the shape of H. Ducreyi

Answer 1

Small, pleomorphic or sometimes rod shaped coccobacilli

Question 2

Is H.Ducreyi aerobic or anaerobic?

Answer 2

H.Ducreyi is a facultative anaerobe which means it can survive in both aerobic and anaerobic conditions.

Question 3

Describe how H.Ducreyi tests for oxidase and catalase tests.

Answer 3

H. Ducreyi tests positive for Oxidase and negative for catalase

Question 4

Which virulence factors are associated with H.Ducreyi?

Answer 4

Pili-FLP (fimbria like proteins)
Cytotoxic haemolysin
LOS

Question 5

What diseases and symptoms are associated with H.Ducreyi?

Answer 5

Chancroid
Mostly seen in men

Dysuria
Abnormal vaginal discharge
Painful ulcers on genitals
Lymphadenopathy
Painful defacation
Rectal bleeding
Kissing ulcers

Question 6

What treatment options are available for H.Ducreyi?

Answer 6

Single dose of Azithromycin or Ceftriaxone

Multiple dose with Ciproflaxin or erythromycin