Flashcards in HIV associated Deck (16):
What is rhodococcus equi a cause of and who should be worried?
*people with decreased cellular immunity
Microscopy characteristics of Rhodococcus equi?
Short gram-positive acid-fast bacillus.
*almost coccoid in shape
How does one normally acquire a Rhodococcus equi infection?
Contact with farm animals.
*in many cases there has been no obvious contact with farm animals
What is Mycobacterium Avium Complex (MAC)?
Is a group of bacteria that are related to tuberculosis.
Which group of people are at risk of contracting disease due to MAC?
What can MAC be the cause of?
*but any organ can be involved
How to diagnose a MAC infection?
Culture the organisms from:
How does one acquire MAC?
From environmental sources.
What might a child with MAC present with?
Isolated cervical lymphadenopathy.
Drugs used to treat MAC?
Clarithromycin or azithromycin + ethambutol.
*treatment may have to be continued for life
What does Haemophilus ducreyi cause?
Chancroid "soft chancre"
Pathogenesis of Haemophilus ducreyi?
Exposure > incubation > papule a appear on genitalia > papule a develop into painful necrotic ulcers with soft ragged edges
Laboratory characteristics of Haemophilus ducreyi?
Is a fastidious organism.
Requires X-factor only.
What anatomical region is involved in 1/2 of cases of Haemophilus ducreyi? What happens to this tissue?
Inguinal lymph nodes > acute suppurative lymphadenitis > abscess formation.
What antibiotic doesn't usually work against Haemophilus ducreyi and why is that so?