Clinical

Question 1

Pigment produced by Actinomyces israelii

Answer 1

Yellow “sulfur” granules

Question 2

Pigment produced by S. aureus

Answer 2

Yellow pigment

Question 3

Pigment produced by Pseudomonas aeruginosa

Answer 3

Blue-green pigment (pyocyanin and pyoverdin)

Question 4

Pigment produced by Serratia marcescens

Answer 4

Red pigment

Question 5

Most common cause of acute endocarditis

Answer 5

Staphylococcus aureus

Question 6

Etiologic agent:

• pneumonia complicated by empyema, abscess or pneumatocoele
• post viral pneumonia

Answer 6

S. aureus

Question 7

Etiologic agent: gastroenteritis after consuming salad made with mayonnaise

Answer 7

S. aureus

due to heat stable staphylococcal enterotoxin

Question 8

Most common cause of:

• PROSTHETIC valve endocarditis
• septic arthritis in prosthetic joints
• ventriculoperitoneal shunt infections

Answer 8

S. epidermidis

Tx: vancomycin

Question 9

2nd most common cause of UTI in sexually active women

Answer 9

S. saprophyticus

Tx: fluoroquinolones, tmp-smx

Question 10

Most common cause of neonatal pneumonia, sepsis, and meningitis

Answer 10

Group B Streptococcus (S. agalactiae)

Tx:

• penicillin g
• penicillin g + aminoglycoside (serious infxn)

Question 11

Etiologic agent: endocarditis in patient who underwent GIT surgery

Answer 11

Enterococcus faecalis (group D strep)

Question 12

Etiologic agent: marantic endocarditis in patients with abdominal malignancy

Answer 12

Streptococcus bovis

Question 13

Most common cause of CAP in adults; rust-colored sputum

Most common cause of bacterial meningitis in adults

Most common cause of otitis media in children

Answer 13

S. pneumoniae

Tx: penicillin g
Levofloxacin or vancomycin with ceftriaxone for penicillin resistance

Question 14

Etiologic agent: dental caries

Answer 14

S. mutans

Question 15

MCC of subacute and native valve endocarditis

Answer 15

S. sanguis

Viridans streptococci enhances adhesion to damaged heart valves

Question 16

Etiologic agent: brain abscesses

Answer 16

S. intermedius

Question 17

EA: woolsorter’s disease (contact with infected animals or inhalation of spores from animal hair or wool)

Answer 17

Bacillus anthracis

Question 18

Pulmonary hemorrhage is the mcc of death in: (3)

Answer 18

• anthrax
• leptospirosis
• congenital syphilis

Question 19

MCC of meningitis in immunocompromised patients

2nd MCC of meningitis in people > 50yo

Answer 19

Listeria monocytogenes

Question 20

Causes of neonatal meningitis (3)

Answer 20

• groub B strep
• E. coli
• Listeria monocytogenes

Question 21

Cause culture negative subacute bacterial endocarditis in pxs with preexisting heart disease (2)

Answer 21

Eikinella corrodens

Kingella kingae

Question 22

HACEK group members

Infective endocarditis

Answer 22

Haemophilus spp
Aggregatibacter spp
Cardiobacterium spp
Echinella corrodens
Kingella spp

Question 23

MCC of meningitis in ages 2-18

Answer 23

Neisseria meningitidis