Lab 9

Question 1

Whats a nosocomial infection

Answer 1

an infection that happens in healthcare aossociated

Question 2

What is selective media

Answer 2

Its media that promotes growth of some but inhibits the growth in others

Question 3

What is differential media

Answer 3

Media that contain certain eleemnts thaat diferences organisms togehte

Question 4

Catalase test is a differential test for

Answer 4

Gram positive cocci

Staphylococcus: +
Streptococcus: -

Question 5

Whats the mannitol salt agar (MSA)

Answer 5

its a selective and differential media used to + isolate gram positive staphlylococci from gram negative

+ differentiate s aureus from other staphyloccoi

Question 6

Whats the selective component of MSA

Answer 6

Sodium chloride. High concnetration only allows growth of staphylocci.

Other organisms: effect of osmotic pressure on bacteria
(bc they can adapt to salty habitats: human skin and can grow on MSA)

Question 7

What is the differential component of the medium

Answer 7

Mannitol. When