Loeffler's serum medium is recommended for the cultivation of which organism?

Loeffler's serum medium is recommended for the cultivation of which organism?

• A. Abiotrophia sp.
• B. Corynebacterium diphtheriae
• C. Leuconostoc sp.
• D. Streptococcus agalactiae

Answer: (B)

Loeffler's serum medium is an enriched environment designed to meet the needs of fastidious organisms, particularly Corynebacterium diphtheriae. The serum provides growth factors that allow C. diphtheriae to thrive and, in many strains, to develop characteristic features that help with identification, such as metachromatic granules seen with special staining. Other organisms listed don’t require this serum enrichment: Abiotrophia species need highly specific nutrients not provided by Loeffler’s, while Leuconostoc and Streptococcus agalactiae grow well on more common media like blood or chocolate agar. So, the medium is best suited for cultivating Corynebacterium diphtheriae.

Loeffler's serum medium is an enriched environment designed to meet the needs of fastidious organisms, particularly Corynebacterium diphtheriae. The serum provides growth factors that allow C. diphtheriae to thrive and, in many strains, to develop characteristic features that help with identification, such as metachromatic granules seen with special staining. Other organisms listed don’t require this serum enrichment: Abiotrophia species need highly specific nutrients not provided by Loeffler’s, while Leuconostoc and Streptococcus agalactiae grow well on more common media like blood or chocolate agar. So, the medium is best suited for cultivating Corynebacterium diphtheriae.