Microbiology

Question 1

Gram Positive cocci that synthesize dextrans from glucose

Answer 1

Viridan Streptococci

S. mutants, S. sanguis

Question 2

Erythema Nodosum

Answer 2

Erythematous to violaceous subcutaneous nodules on the leg

Associated with (Strep pyogenese, Staph aureus, coccidiomycosis, chlamydia, sarcoidosis, crohns disease)

Question 3

Viridan streptococci symptom

Answer 3

Abdominal abscesses, septicemia, deep wound infection

subacute bacterial endocarditis with preexisting cardiac valvular defect after dental manipulation

Use prophylaxis!

Question 4

Exotoxin that increase sensitivity to histamine

Answer 4

Pertussis

Stimulate adenylate cyclase to increase cAMP, leading to increased insulin production, lymphocyte and neutrophil dysfunction, and increased sensitivity to histamine

Question 5

Coccidioides immitis presentation

Answer 5

Acute pneumonia
Chronic progressive pneumonia
Pulmonary nodules and cavities
Extrapulmonary nonmeningeal disease
Meningities

Erythema nodosum

Question 6

Fungal infection associated with pigeon droppings

Answer 6

Cryptococcus neoformans

Question 7

Dimorphic fungi associed with bird dropping, bat dropping, or caves

Answer 7

Histoplasma capsulatum

Question 8

Fungal infection associated with previous TB infection

Answer 8

Aspergillus fumigatus (fungal ball)

Question 9

Fungal infection in pt who had chemotherapy

Answer 9

Neutropenia

Candida albicans, A. fumigatus, mucor, rhyzopus

Question 10

Pt with asthma developing allergic reaction with bronchiectasis and eosiniphilia

Answer 10

Aspergillus fumigatus - allergic bronchopulmonary aspergillosis (ABPA)

Question 11

Association between impetigo infection vs pharyngeal infection and the formation of Glomerulo nephritis and rheumatic fever

Answer 11

Impetigo- PSGN ONLY

Pharyngeal infection- both PSGN and RF

Question 12

Impetigo causes

Answer 12

Strep pyogenes (GABHS)

Staph aureus

Question 13

Fever, diarrhea, rose spots on abdomen

Answer 13

Salmonella typhi

Question 14

Ribosylation of EF 2

Answer 14

Pseudomonas and corynebacteria diptheria

Question 15

Inhibition of the 60S subunit

Answer 15

Shigella and EHEC

Question 16

CNS infection with HIV

Answer 16

Cryptococcus neoformans

Treat with amphotericin B, flucytosine for meningitis

PPX: fluconazole

Question 17

Non septate hyphae that branch and WIDE angles

Answer 17

Mucor and Rhizopus

paranasal sinus infection in immunocompromized

Question 18

Positive CNS Latex agglutination test

Answer 18

Cryptococcus neofromans

Question 19

Meningitis vaccine

Answer 19

contains capsular polysaccharides

Question 20

EBV infects which cells and how

Answer 20

B cells via CD21

Question 21

HIV infects cells how

Answer 21

gp120 to CD4 T cells, and coreceptor CCR5 or CXCR4 (mutations stop binding)

Question 22

Parvovirus invades cells how

Answer 22

Erythrocyte P antigen- attacks erythroid cells

Question 23

Wedge shaped pulmonary infarct

Answer 23

Think infarct!! lung infarct is hemorrhagic because it has duel blood supply

Question 24

IV drug user endocarditis common organism

Answer 24

Most common= Staph aureus

2nd most= Pseudomonas aeriginosa