STREPTOCOCCI

Question 1

What family does Streptococci belong

Answer 1

Streptococcaceae.

Question 2

Some species are part of the

Answer 2

indigenous human microbiota.

Question 3

what type of microorganism does some species of Steptococcus belong

Answer 3

capnophilic

Question 4

what makes their growth enhances where it is incorporated in culture media

Answer 4

blood, serum, or glucose

Question 5

what mircoorganism are not included in the Lancefield classification

Answer 5

viridans group and S. pneumoniae

Question 6

microscopy:

Answer 6

Gram positive spherical cells that are arranged in chains or pairs

Question 7

culture:

Answer 7

Appear grayish, pinpoint, and translucent to slightly opaque while some species have mucoid
colonies.

Question 8

biochemical tests:

Answer 8

(-) catalase, oxidase and gas production; non motile and ferments carbohydrates

Question 9

Notorious pathogens:

Answer 9

Streptococcus pyogenes and Streptococcus pneumoniae.

Question 10

classification of streptocococci

Answer 10

• Academic/ Bergey’s Classification
• SMITH AND BROWN CLASSIFICATION
• LANCEFIELD CLASSIFICATION

Question 11

classification based on temperature requirement

Answer 11

• PYOGENIC GROUP
• VIRIDANS GROUP
• LACTIC GROUP
• ENTEROCOCCUS GROUP

Question 12

classification based on Hemolytic pattern

Answer 12

• ALPHA HEMOLYTIC STREPTOCOCCI
• BETA HEMOLYTIC STREPTOCOCCI
• GAMMA / NON-HEMOLYTIC

Question 13

classification based on the extraction of C CARBOHYDRATE from streptococcal cell wall

Answer 13

Lancefield classification

Question 14

• Neither grow at 10°C nor at 45°C, but only at 37°C
• Mostly beta hemolytic reactions
• S.pyogenes and Groups C and G streptococci

Answer 14

pyogenic group

Question 15

what temp does a pyogenic group grow

Answer 15

37°C

Question 16

example of microorganism in pyogenic group

Answer 16

S.pyogenes and Groups C and G streptococci

Question 17

• Grow at both 45°C and 37°C
• Not part of the Lancefield Group but some are
  alpha hemolytic

Answer 17

viridans group

Question 18

what temp does viridans group grows

Answer 18

45°C and 37°C

Question 19

Not part of the Lancefield Group but some are alpha hemolytic

Answer 19

Viridans group

Question 20

• It will grow at 10°C and 37°C
• Non-hemolytic and has Lancefield N antigen
• Often found in dairy products
• S. lactis, causes normal coagulation or souring of milk

Answer 20

Lactic group

Question 21

what temp does lactic group grows

Answer 21

10°C and 37°C

Question 22

Non-hemolytic and has Lancefield N antigen

Answer 22

lactic group

Question 23

Often found in dairy products

Answer 23

LACTIC GROUP

Question 24

• Grow at 10°C, 45°C and 37°C
• Part of normal microbiota of the human intestine
• E.faecalis

Answer 24

ENTEROCOCCUS GROUP

Question 25

microorganism that causes normal coagulation or souring of milk

Answer 25

S. lactis

Question 26

what temp does ENTEROCOCCUS GROUP belong

Answer 26

10°C, 45°C and 37°C