Streptococcus agalactiae grows in which specialized media?

Streptococcus agalactiae grows in which specialized media?

• A. Granada medium
• B. MacConkey agar
• C. Blood agar
• D. Chocolate agar

Answer: (A)

Streptococcus agalactiae is identified on Granada medium because it produces a distinctive pigment, granadaene, when grown there. This pigment gives the colonies an orange hue that stands out against the medium, providing a rapid visual indication of Group B Streptococcus. Granada medium is specifically designed to exploit this trait for quick screening, especially in prenatal testing. Other media like MacConkey (which targets many Gram-negative bacteria) won’t reveal this pigment, and while blood agar and chocolate agar support growth, they don’t provide the specialized visual marker that Granada medium offers.

Streptococcus agalactiae is identified on Granada medium because it produces a distinctive pigment, granadaene, when grown there. This pigment gives the colonies an orange hue that stands out against the medium, providing a rapid visual indication of Group B Streptococcus. Granada medium is specifically designed to exploit this trait for quick screening, especially in prenatal testing. Other media like MacConkey (which targets many Gram-negative bacteria) won’t reveal this pigment, and while blood agar and chocolate agar support growth, they don’t provide the specialized visual marker that Granada medium offers.