microb

Question 1

organism: steatorrhea + travel hx

Answer 1

giardia (parasite)

Question 2

treatment: steatorrhea + travel hx

Answer 2

metronidazole (anaerobic bacteria, protozoa)

Question 3

organism: food poisoning + guillain-barre syndrome

Answer 3

campylobacter jejuni

Question 4

organism: GE on cruise ship

Answer 4

norovirus

Question 5

treatment: post-antibiotic infection

Answer 5

PO vancomycin or PO metronidazole (CDAD)

Question 6

organism: post-antibiotic infection

Answer 6

CDAD

Question 7

organism: diarrhoea among kids

Answer 7

rotavirus

Question 8

organism: diarrhoea 1 month after shellfish ingestion

Answer 8

hep A

Question 9

organism: mastitis in first time mother

Answer 9

staph aureus

Question 10

finger lesions with serous exudate?

Answer 10

HSV1 {vs staphylococcal whitlow with purulent exudate)

*healthcare workers are at risk of whitlow

Question 11

“owl’s eye” inclusions

Answer 11

CMV (cytomegalovirus) or hodgkin lymphoma

Question 12

infectious mononucleosis syndrome

Answer 12

EBV classically (CMV also can)

Question 13

how to distinguish infectious mononucleosis between EBV and CMV

Answer 13

EBV has heterophile antibodies

use the Paul-Bunnell test

Question 14

Do NOT give ___ for EBV infection?

Answer 14

ampicillin (will make rash worse)

Question 15

shingles pathogenesis (impt)

Answer 15

1. reactivate latent VZV in sensory ganglia after 1º chicken pox
2. virus travels along sensory axons from sensory ganglia = dermatoic distribution
3. more severe if cranial dermatome distribution aka opthalmic zoster

Question 16

HHV8 is aka

Answer 16

Kaposi’s sarcoma

Question 17

incubation period of hep B

Answer 17

120 days

Question 18

incubation period of hep A

Answer 18

30 days

Question 19

bacteria endemic to soil in tropical rainy areas

Answer 19

burkholderia pseudomallei (mimics tb, but causes melioidosis instead)

Question 20

post-exposure prophylaxis for hiv

Answer 20

2 NRTIs (but not lamivudine and emtricitabine together) + integrase/protease inhibitor OR non-NRTI

• within 72 hours
• daily for 28 days

Question 21

pre-exposure prophylaxis for hiv

Answer 21

truvada - tenofovir + emtricitaine (2 NRTIs)

• take till 4 weeks after exposure is over

Question 22

what infection assoc with ectopic pregnancy

Answer 22

chlamydia trachomatis

Question 23

who has highest incidence of invasive strep pneumo

Answer 23

children under one year (CAP)

Question 24

most common cause of hospital assoc UTI

Answer 24

pseudomonas aeruginosa

Question 25

positive dark field microscopy

Answer 25

syphilis (treponema pallidum)

Question 26

treatment of syphilis

Answer 26

pen G

Question 27

hutchinson’s triad

Answer 27

eyes, ears, teeth

• interstitial keratitis
• sensorineural deafness
• hutchinson’s teeth

Question 28

treatment for strep pyogenes

Answer 28

penicillin for 10 days (+ clindamycin + IVIG + debridement for necrotising fasciitis, use pen G for cellulitis)

Question 29

vibrio cholerae treatment

Answer 29

doxycycline

Question 30

what organism likely causes pyelonephritis

Answer 30

E. coli > proteus > klebsiella

Question 31

splenectomy predisposes to what infection

Answer 31

strep pneumo, neisseria meningitidis

Question 32

first line treatment for PAE

Answer 32

pip-tazo

Question 33

organism: foul, yellow-green vaginal discharge, discharge, dysuria (in men also)

Answer 33

trichomonas vaginalis (parasite)

Question 34

virus most assoc with transplant patients

Answer 34

cmv

Question 35

cmv treatment

Answer 35

ganciclovir

Question 36

bulls-eye rash

Answer 36

lyme disease (borrelia burgdoferi)

Question 37

treatment: rickettsia rickettsi (rocky mountain spotted fever)

Answer 37

doxycycline