Non-specific questions, whole semester questions

Question 1

<p>What bacteria cause meningitis most frequently in infants?

In children 6 months - 3 years?</p>

Answer 1

<p>In infants, acquired while passing birth canal.

- Listeria monocytogenes
- Escherichia coli
- Group B Streptococcus. (Streptococcus agalactiae)

In young children:
Neisseria meningitidis
Haemophilus influenzae</p>

Question 2

What is EMB agar used for?

Answer 2

Eosin methylene blue agar (EMB) is a selective and differential medium used to isolate fecal coliforms. Eosin Y and methylene blue are pH indicator dyes which combine to form a dark purple precipitate at low pH; they also serve to inhibit the growth of most Gram positive organisms

Question 3

What causes atypical pneumonia

Answer 3

Mycoplasma pneumoniae
Legionella pneumophila
Chylamydophila
Viruses

It is claimed to have more of a dry cough, and different radiological imaging characteristics, and just be generally slightly less severe than normal pneumonia, and is also called ‘walking pneumonia’

This has mostly been shown untrue, but still sometimes used terms.

Question 4

What common biochemical feature do all motile enteric bacteria share?

Answer 4

All motile enteric bacteria are also H2S positive,
Meaning they will grow black colonies on:
Bismuth Sulfite Agar
TSI Triple-Sugar-Iron medium (contains Iron sulfites)

Question 5

What is Christensen medium used for?

What 4 bacteria are positive in this test?

Answer 5

To test for Urease activity

Klebsiella, Proteus, H pylori, 
Ureaplasma Urealyticum (a mycoplasma)