Medias

What is the general purpose of TSA/NA media?

It grows all microorganisms except for fastidious organisms.

What type of media is CBA and what does it contain?

CBA is an enriched and differential media that contains whole sheep's blood.

What is the significance of observing hemolysis on CBA media?

It allows for the identification of different types of hemolytic bacteria.

What do colistin and nalidixic acid in CNA media inhibit?

They inhibit Gram-negative bacteria.

What is unique about the blood in CHOC media?

The blood is lysed, which releases V factor and X factor.

What type of bacteria does SDA media select for and why?

It selects for fungi due to its low pH that inhibits bacterial growth.

What are the main components of MSA media and its inhibitory effect?

MSA contains mannitol and phenol as a pH indicator, and its 7.5% salt concentration inhibits most bacteria except Staphylococci species.

What is the differential effect of MAC media on lactose fermenters?

Lactose fermenters turn pink, while non-fermenters remain colorless.

What inhibits gram-positive bacteria in MAC media?

Bile salts and crystal violet.

What does HE media indicate with sugar fermentation?

It is differential and selective for sugar fermentation processes specifically for Salmonella and Shigella.

What does H2S production in HE media indicate?

It indicates the presence of certain bacteria, such as Salmonella.