List of bacteria

Question 1

Streptococcus pyogenes : Group A

Answer 1

GRAM +VE

1. Catalase -ve
2. b-haemolysis on HBA
3. Resistant to bactiracin
4. Blue staining round shaped in chains

Question 2

Streptococcus pneumoniae

Answer 2

GRAM +VE

1. Catalase -ve
2. alpha-haemolysis on HBA
3. Sensitive to optochin
4. Blue staining round shaped in chains

Question 3

Staphylococcus aureus

Answer 3

GRAM +VE

1. Catalase +ve
2. Coagulase +ve
3. Confirmation on mannitol sugar agar (MSA) –> turns yellow

Question 4

Neisseria spp

Answer 4

GRAM -VE

1. round shaped on gram stain under microscope

Question 5

Clostridium spp

Answer 5

GRAM -VE

1. rod-shaped on gram stain
2. endospore formation

Question 6

Listeria monocytogenes

Answer 6

GRAM -VE

1. rod shaped on gram stain
2. no endospore formation

Question 7

Haemophillus influenzae

Answer 7

GRAM -VE

1. rod-shaped/bacillus
2. Oxidase +ve
3. straight bacillus
4. grows on chocolate agar

Question 8

Escherichiae coli

Answer 8

GRAM -VE

1. bacillus/rod shaped
2. Oxidase -ve
3. Grows on MAC(macconkey) agar +lactose fermentation (turns pink on a yellow agar)
4. green sheen on EMB(eosin methylene blue) agar

Question 9

Shigella spp

Answer 9

GRAM -VE

1. bacillus/rod shaped
2. Oxidase -ve
3. Grows on MAC(macconkey) agar but no lactose fermentation (no colour change)
4. Grows on XLD agar but does not change the colour (pink)

Question 10

Salmonella spp

Answer 10

GRAM -VE

1. bacillus/rod shaped
2. Oxidase -ve
3. Grows on MAC(macconkey) agar but no lactose fermentation (no colour change)
4. Grows on XLD agar and turns the centre of colonies black