Question:
The pyogenic group of Streptococci which is known to be weakly beta or gamma hemolytic on blood agar causing mastitis is:
The pyogenic group of Streptococci which is known to be weakly beta or gamma hemolytic on blood agar causing mastitis is:
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S. agalactiae: mastitis pathogen.
Weakly beta or gamma hemolytic.
Group B Streptococcus.
Weakly beta or gamma hemolytic.
Group B Streptococcus.
Updated On: Aug 18, 2026
- S. pyogenes
- S. agalactiae
- S. thermophilus
- S. durans
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Streptococci are classified by hemolysis on blood agar.
Some species cause mastitis.
Step 2: Key Formula or Approach:
No specific formula.
Need to know the characteristics of Streptococci.
Step 3: Detailed Explanation:
Streptococcus agalactiae is a pyogenic group B Streptococcus.
It is weakly beta or gamma hemolytic on blood agar.
It causes mastitis in cattle.
S. pyogenes is beta-hemolytic but not a major mastitis pathogen.
S. thermophilus is used as a starter culture.
S. durans is a group D Streptococcus.
Thus, S. agalactiae is the correct answer.
Step 4: Final Answer:
S. agalactiae is weakly beta or gamma hemolytic causing mastitis.
Hence, the correct option is (B). \bigskip
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