STEP 1- Microbiology systems Flashcards Preview

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Flashcards in STEP 1- Microbiology systems Deck (18):
1

Meningitis: causes (GEL)
Newborns (3)

Group B strep
E. coli
Listeria

2

Meningitis: causes
Children (6mo-6years) 4

1. S. pneumoniae
2. N. meningitidis
3. HiB
4. Enteroviruses

**S. pneumo occurs in all age groups except newborns
**HiB incidence decreasing d/t vaccine. Cases are seen in unimmunized children

3

Meningitis:
Adults (6years-60) 4

S. pneumo
N. meningitidis
Enteroviruses
HSV-- shingles making a comeback

4

Meningitis:
Elderly (60+) 3

S. pneumo
Gram negative rods (salmonella, e coli, pseudomonas, shigella, klebsiella)
Listeria

5

Empiric treatment for meningitis (2)
If listeria is suspected?

Ceftriaxone and vancomycin.
Add ampicillin if Listeria suspected

6

Common causes of viral meningitis (5)
3 of which are related

Enteroviruses
HSV-1 (encephalitis)
HSV-2 (rarely)
HIV
VZV

7

Meningitis in HIV patient (4)

Cryptococcus
CMV
Toxoplasmosis
JC virus

8

Opening pressure in bacterial, fungal, and viral meningitis

All increased
Viral may be normal or increased

9

Cell type found in CSF in meningitis for bacterial, fungal, and viral

Bacterial: increased neutrophils
Fungal: increased lymphocytes
Viral: increased lymphocytes

10

Protein levels in meningitis CSF for bacterial, fungal, and viral

Bacterial and fungal will show INCREASED protein levels.
Viral may be NORMAL or INCREASED

11

Glucose levels in meningitis CSF for bacterial, fungal, and viral

Bacterial and fungal will show DECREASED glucose levels
Viral will show NORMAL levels of glucose

12

Most common cause of osteomyelitis

Staph aureus

13

osteomyelitis--sexually active

Neisseria gonorrhoeae (rare)
N. gonorrhoeae more commonly causes septic arthritis, not osteomyelitis

14

osteomyelitis: diabetics and IV drug user (2)

Pseudomonas or Serratia

15

osteomyelitis: sickle cell

salmonella

16

osteomyelitis: prosthetic joint replacement (2)

S. aureus and S. epidermis

17

osteomyelitis: vertebral involvement

Mycobacterium (Pott disease)

18

osteomyelitis: cat and dog bites

Pasteurella multicoda