Gram positive bacteria Flashcards Preview

Principles of Disease HQ > Gram positive bacteria > Flashcards

Flashcards in Gram positive bacteria Deck (16)
Loading flashcards...
1

What colour do Gram positive bacteria stain?

Purple (crystal violet/iodine complex)

2

What are the two main classes of Gram positive bacteria?

Cocci (round)
Bacilli (rod)

3

What are the two main classes of Gram positive cocci?

Staphylococci (clusters)
Streptococci (chains)

4

How are staphylococci further distinguished?

Coagulase test; positive or negative

5

Name a type of coagulase positive bacteria and give its symptoms

Staph. aureus;
-commensal in nose/groin
-boils/blood and food poisoning
-methicillin resistant = MRSA

6

Name a type of coagulase negative bacteria and give its symptoms

Staph epidermidis;
-skin commemsal
-pathogenic in presence of prosthetics/foreign bodies

7

How are streptococci further distinguished?

Haemolysis; alpha (partial)/beta (full)/non-haemolytic

8

What action does alpha-haemolytic bacteria have on blood agar?

Turns it green

9

What action does beta-haemolytic bacteria have on blood agar?

Turns it clear

10

Name a type of alpha-haemolytic bacteria and give its symptoms

Strep. pneumonia;
-pneumonia
-meningitis
-blood poisoning

11

Name a type of beta-haemolytic bacteria and give its symptoms

Strep. pyogenes - Lancefield group A
-sore throat
-cellulitis
-necrotising fasciitis

12

Name a type of non-haemolytic bacteria and give its symptoms

Enterococcus
-gut commensal
-causes UTI

13

What are the two main classes of Gram positive bacilli?

aerobic/anaerobic
large/small

14

Give the main class of anaerobic Gram positive bacilli

Clostridium species

15

Name the three main type of clostridium

Difficile
Perfringens
Tetani

16

Give some of the main symptoms of clostridium difficile?

Diarrhoea
Pseudomembranous colitis