VMD-0174
QUESTION
Read the following sentences and choose the most appropriate answer from the option given below:
(a) Mastitis streptococcus include S. agalactiae, S. dysgalactiae and S. uberis.
(b) S. agalactiae produce beta haemolysis on blood agar.
(c) Hotis and Miller’s test is used for the detection of S. agalactiae.
(d) S. dysgalactiae shows wide zone of beta hemolysis in camp test.
(e) In direct smear milk sediment streptococcus appear as gram positive in cluster.
OPTIONS
(A) All of the above statements are true
(B) a, b and c are true, but d and e are not true
(C) None of the above are true
(D) a and d are true, c, d and e are not true
ANSWER
(B) a, b and c are true, but d and e are not true
EXPLANATION
Statements a, b, and c are accepted: important mastitis streptococci include S. agalactiae, S. dysgalactiae, and S. uberis; S. agalactiae may show beta hemolysis; and the Hotis test is used for detection of streptococcal mastitis. The CAMP reaction statement for S. dysgalactiae and the claim that streptococci form gram-positive clusters are incorrect, because streptococci characteristically form chains.
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