Question

What type of culture media is used for Ligionella?

• A. (BCYE) agar media
• B. MacConkey agar
• C. Baird–Parker agar
• D. Sabouraud’s agar

Answer 1

The Correct Option is A

Step 1: The organism in question, Legionella, has demanding growth requirements and will not appear on ordinary plates.
Step 2: Its growth depends on L-cysteine and iron salts together with alpha-ketoglutarate and yeast extract; the medium that supplies all of these is buffered charcoal yeast extract agar.
Step 3: For clinical samples that carry competing flora, an antibiotic-containing selective version of BCYE is recommended to suppress contaminants while Legionella grows.
Step 4: The other options target unrelated organisms - lactose fermenters, staphylococci and fungi - so none isolates Legionella.
\[\boxed{\text{BCYE agar}}\]