Agars and other selective tests

Question 1

Tellurite agar

Answer 1

Corynebacterium

Question 2

High salt media

Answer 2

Staphylococcus aureus

golden colonies

Question 3

Coagulase +

Answer 3

Staphylococcus

Question 4

ASO test

Answer 4

steptolysin O antibodies

Question 5

Dieterle stain (silver impregnation)

Answer 5

Legionella pneumophila

Question 6

BCYE agar

Answer 6

Legionella pneumophila

cysteine, ferric iron and low pH

Question 7

PPD test

Answer 7

Mycobacterium tuberculosis
+= individual has been infected or vaccinated
-=indvidual never exposed, not developed hypersensitivity,
lost reaction due to immunosuppression or disappereance of antigen

Question 8

Quantiferon-TB gold test

Answer 8

Mycobacterium tuberculosis
measures IFn-gamma production 
not affected by prior vaccination 
Can detect latent infection
Can't detect if disease is active

Question 9

Immunofluorescence and ELISA

or DNA tests

Answer 9

Chlamydia trachomatis

Question 10

Thayer Martin Agar

Answer 10

Neisserria gonorrhoeae

Question 11

Dark field microscopy

Answer 11

Treponema pallidum

Question 12

ELISA confirm with Western

Answer 12

Borrelia burgdoferi

Question 13

alpha hemolysis

Answer 13

sterptococcus pneumonia

Question 14

Red colonies on MacConkey

Answer 14

E. Coli ferment lactose