Question

Microbiology - Gram Positive (ONLY answer)

[Q1] Bile Esculin is used to distinguish

- Streptococci and Enterococci

- Streptococci and Staphylococci

- E. coli and Salmonella

- Enterobacter and Streptococci

[Q2] Name two infections associated with Staphylococci.

[Q3] Name two infections associated with Streptococci.    

Answer 1

Q1)

Answer: Streptococci and Enterococci

Explanation:

The bile salts present in the media acts as a selective component and the esculin acts as a differential ingredient. The media is used to distinguish between Streptococcus and Enterococcus. The organisms belongs to the genus Enterococcus has the ability to grow in the presence of bile salts and it also hydrolyze the esculin present in the media producing a black color in the plate.

Q2)

1. Endocarditis - It is an infection of the inner lining of the heart, endocardium. Staphylococci is one of the pathogen causing infection to endocardium.

2. Septic arthritis- It is the infection on the joints and Staphylococcus aureus is the common cause of Septic arthritis.

Q2)

1. Strep throat - It is an infection in the throat caused by streptococcus.

2. Pneumonia - It is an infection affecting the respiratory tract involving inflammation in the air sacs of lungs. Staphylococcus pneumoniae is one of the pathogen which causes pneumonia.