Bacterial Classification Quiz

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What are the three common classification schemes for Streptococci and Enterococci?

Hemolytic pattern on SBA, Physiologic characteristics, Serologic grouping or typing of C carbohydrate, capsule, or surface proteins

Name three biochemical tests used for identifying Streptococci and Enterococci.

Bacitracin susceptibility, CAMP test, Hippurate hydrolysis

Which two tests are used to confirm the presence of Group B Streptococcus (S. agalactiae)?

CAMP test, β-hemolysin

What is the significance of Bacitracin susceptibility test?

It helps differentiate between Streptococcus pyogenes (sensitive) and other beta-hemolytic Streptococci (resistant). Signup and view all the answers

What does the Hippurate hydrolysis test indicate?

It helps in differentiating between different Streptococci and Enterococci species based on their ability to hydrolyze hippurate. Signup and view all the answers

How does the CAMP test work in identifying Streptococci?

It involves streaking two different bacteria perpendicular to each other to detect enhanced hemolysis at the intersection, confirming the presence of Streptococcus agalactiae. Signup and view all the answers

What family do Streptococcus and Enterococcus belong to?

Streptococcaceae Signup and view all the answers

How can you differentiate Streptococcus and Enterococcus from staphylococci?

Catalase-negative Signup and view all the answers

What type of bacteria are Streptococcus and Enterococcus in terms of shape?

Gram-positive cocci Signup and view all the answers

What kind of arrangement is usually seen in Streptococcus and Enterococcus?

Pairs or chains Signup and view all the answers

What kind of reactions can be seen in Streptococcus and Enterococcus when grown in media containing blood?

Weak false-positive catalase reactions Signup and view all the answers

What type of metabolic pathway do Streptococcus and Enterococcus use for carbohydrates?

Fermentative (glucose) Signup and view all the answers

What are the three most common clinical infections directed by Enterococcus?

<ol> <li>UTI, 2. Bacteremia, 3. Endocarditis</li> </ol> Signup and view all the answers

What type of agar is commonly used in the laboratory diagnosis of Enterococcus?

TSA or BHI agar with 5% SRBCs Signup and view all the answers

List three selective media commonly used for Enterococcus diagnosis.

<ol> <li>Bile esculin agar, 2. CNA, 3. PEA</li> </ol> Signup and view all the answers

What are some biochemical tests used for the laboratory diagnosis of Enterococcus?

<ol> <li>Producing acid from CHO, 2. Hydrolyzing arginine, 3. Tolerating 0.04% tellurite</li> </ol> Signup and view all the answers

Which antimicrobial agents is Enterococcus resistant to?

Penicillin, Aminoglycosides, β-lactams, Glycopeptides, Vancomycin Signup and view all the answers

What are some Streptococcus-like organisms mentioned in the text?

Abiotrophia, Granulicatella, Aerococcus, Gemella, Lactococcus, Leuconostoc, Pediococcus Signup and view all the answers