Lesson 2b; streptococcus species

Question 1

also known as pneumococcus, it occurs as slightly pear-shaped cocci in pairs.

Answer 1

streptococcus pneuminiae

Question 2

peptinophilus indolicus is an anaeobic gram positive, which is implicated in bovine summer mastitis in association with what?

Answer 2

Arcanobacterium pyogenes & S. dysgalactiae

Question 3

where is the usual habitat of the streptococcus species?

Answer 3

1. mucosae of the upper respiratory tract
2. lower urogenital tract; suspectible to dessication

Question 4

what are the laboratory differentiation:

Answer 4

1. hemolysis
2. lancefield grouping
3. biochemical testing

Question 5

is complete haemolysis indicated by clear zones around colonies

Answer 5

Beta-haemolysis

Question 6

is partial or incomplete haemolysis indicated by greenish or hazy zones around colonies

Answer 6

Alpha-haemolysis

Question 7

denotes no observation changes in the blood agar around colonies

Answer 7

Gamma-haemolysis

Question 8

_____ is non-pyogenic & is a major pathogen of pigs, septicaemia, meningitis & pneumonia

Answer 8

Streptococcus suis

Question 9

_______ are generally more pathogenic than those producing alpha-haemolysis

Answer 9

Beta-haemolytic streptococci

Question 10

what are the virulence factor in streptococcus species?

Answer 10

1. enzymes
2. exotoxins
   - streptolysins (haemolysins)
   - hyaluronidase
   - NADase
   - DNase
   - streptokinase
   - proteases

Question 11

______ major virulence factor of S. pyogenes, S. pneumoniae, & most strains of s. equi, this are antiphagocytic that protects them from phagocytes.

Answer 11

Polyaccharide capsules

Question 12

in terms for diagnosis specimens should be cultured on?

Answer 12

1. blood agar
2. selective blood agar
3. MacConkey agar

Question 13

in horses streptococcus equi, a febrile disease invloving the upper respiratory tract w/ abscessation of regional lymph nodes.

Answer 13

Strangles

Question 14

what is the tx for strangles?

Answer 14

penicillin & vaccine

Question 15

What is most common streptococcus species ?

Answer 15

S. equi subsp. eqiu in horses

Question 16

In S. equi subsp. equi in horses it causes:

Answer 16

1. Strangles suppurative
2. Purpura hemorrhagica

Question 17

where is the usual habitat of S. equi subsp. equi:

Answer 17

1. upper respiratory tract
2. guttural pouch

Question 18

pyogenic characteristics causes:

Answer 18

1. Abscess formation
2. Suppurative lesions
3. Septicemia

Question 19

What is the diagnoses? note that it should be processed immediately as it easly destroyed by dessication:

Answer 19

Swab camples collected from pus or exudates

Question 20

specimen should be cultured on:

Answer 20

1. Blood agar
2. Selective blood agar
3. MacConkey agar

Question 21

identification criteria in diagnosis:

Answer 21

1. Small translucent colonies (some maybe mucoid)
2. Type of haemolysis on blood agar
3. Chains of gram positive-cocci
4. No growth on MacConkey agar
5. Negative catalase test: Lancefield grouping or Biochemical test profile

Question 22

In streptococcus suis infection: Asymptomatic carrier pigs harbous S. suis in?

Answer 22

Tonsillar tissue

Question 23

Streptococcus suis infection are most common in intensively reared pigs when they are subjected to:

Answer 23

1. Overcrowding
2. poor ventilation
3. stress factors

Question 24

______ is fatal & is characterized by fever, tremors, incoordination, opisthotonos & convulsions.

Answer 24

Meningitis

Question 25

Infections with S. suis have also been recorded in:

Answer 25

1. Cattle
2. Small ruminants
3. Horses
4. Cats

Question 26

this 3 are the principal pathogens involved in streptococcal mastitis:

Answer 26

1. Streptococcus agalactiae
2. S. dysgalactiae
3. S. uberis

Question 27

What is the diagnosis in bovine streptococcal mastitis:

Answer 27

1. clinical signs
2. sugar fermentation test
3. molecular identification of organisms by real-time PCR

Question 28

pyogenic charcteristics causes:

Answer 28

1. abscess formation
2. suppurative lesions
3. septiceamia