Now, let's shift to Haemophilus Ducreyi which is much less
It is a cause of the sexually-transmitted infection known as
Chancroid is symptomatic in males and as you can see from
the projected image,
you could imagine why that would be.
Chancroid, when it occurs, in females, is quite
The pathogenesis of Haemophilus ducreyi has to do with Pili
which will attach to underlying genital and perianal mucosa.
Clinical manifestations, Haemophilus Ducreyi and chancroid
is a cause of one of the painful ulcers of the genitals.
Unlike some other causes which we'll talk about in other
parts of these series
which cause painless ulcers of the genitals, chancroid is
In five to seven days after exposure to the organism and
starting to develop those painful ulcers on the genitalia,
then a local or regionalized lymph reaction via inguinal
lymphadenopathy will develop.
Because this is a rapid onset of swollen lymph nodes, those
lymph nodes will be tender.
They're stretching the capsule of the lymph node in which
are residing the pain fibers.
Diagnosis largely is a diagnosis of exclusion.
Primary syphilis and herpes simplex are very common causes
although more often than not,
may cause painless lesions.
If one can exclude those clinically, then treatment for
with Haemophilus ducreyi is accomplished with ceftriaxone
So we have two different manifestations of two different
types of Haemophilus.
One, very common, one, thankfully somewhat unusual.
The Haemophilus influenzae, however, as the common cause of
many sinopulmonary infections
is absolutely something to be aware of and to think about
when making typical diagnosis.
Here ends the story on Haemophilus.