HIV associated Flashcards Preview

Microbiology > HIV associated > Flashcards

Flashcards in HIV associated Deck (16):
0

What is rhodococcus equi a cause of and who should be worried?

Pneumonia.
*people with decreased cellular immunity

1

Microscopy characteristics of Rhodococcus equi?

Short gram-positive acid-fast bacillus.
*almost coccoid in shape

2

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

3

What is Mycobacterium Avium Complex (MAC)?

Is a group of bacteria that are related to tuberculosis.

4

Which group of people are at risk of contracting disease due to MAC?

Immunocompromised.

5

What can MAC be the cause of?

Pulmonary infection.
*but any organ can be involved

6

How to diagnose a MAC infection?

Culture the organisms from:
- blood
- tissues

7

How does one acquire MAC?

From environmental sources.

8

What might a child with MAC present with?

Isolated cervical lymphadenopathy.

9

Drugs used to treat MAC?

Clarithromycin or azithromycin + ethambutol.
*treatment may have to be continued for life

10

What does Haemophilus ducreyi cause?

Chancroid "soft chancre"

11

Pathogenesis of Haemophilus ducreyi?

Exposure > incubation > papule a appear on genitalia > papule a develop into painful necrotic ulcers with soft ragged edges

12

Laboratory characteristics of Haemophilus ducreyi?

Is a fastidious organism.
Requires X-factor only.

13

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.

14

What antibiotic doesn't usually work against Haemophilus ducreyi and why is that so?

Penicillin.
Beta-lactamase produced.

15

Antibiotics used to treat Haemophilus ducreyi?

Erythromycin or ceftriaxone or ciprofloxacin.