CCBC Microbiology 230-Summer 2022-
QUIZ #4
1. What is beta hemolysis? - ✔✔Beta hemolysis is a clear red blood cell free zone surrounding a
colony. When you see this you know that there has been complete lysis of the r
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CCBC Microbiology 230-Summer 2022-
QUIZ #4
1. What is beta hemolysis? - ✔✔Beta hemolysis is a clear red blood cell free zone surrounding a
colony. When you see this you know that there has been complete lysis of the red blood cells.
2. What does gamma reaction refer to? - ✔✔Gamma reaction refers to when there is NO
hemolysis or discoloration of the agar surrounding the colony.
3. What is alpha hemolysis? - ✔✔Alpha hemolysis is a zone of partial hemolysis surrounding a
colony. It usually has a greenish discoloration on the agar.
4. What is double zone hemolysis? - ✔✔Double zone hemolysis refers to both beta and alpha zone
hemolysis surrounding a colony.
5. The lancefield system is helpful in identifying what type of bacteria? - ✔✔The Lancefield system
is useful identifying streptococci. There are 19 different serological groups within the Lancefield
system.
6. What are two ways that streptococci can be identified? - ✔✔Through the Lancefield system and
Serological typing.
7. What are the Lancefeild group of streptococcus that is the most common cause of acute
streptococcal infections in humans? - ✔✔Streptococus pyogenes which is in the group A beta
streptococci of the Lancefeild serological group is responsible for most acute human strep
infections.
8. What are five Lancefield groups that frequrently causes human infections other then group A
beta streptococci (streptococcus pyogenes) - ✔✔Group B streptococci (S. agalactiae) Gram
positive
Group C streptococci (S. equi, S. equisimillis and S. zooepidemicus)
Group F streptococci (S. anginosus)
Group G Streptococci9. What are the infections that group B streptococci (streptococcus agalactiae) cause? - ✔✔This
streptococcus usually causes pneumonia, septicemia, or menigitis in infants and adults. Also
associated with urinary tract infections, endometritis, infected ulcers.
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