Question

Mannitol salt agar MSA medium is used to select gram positive from gram negative. True or False..? Give explanation.​

Answer 1

True.

• ⚝ Exᴘʟᴀɴᴀᴛɪᴏɴ: It contains a high concentration (about 7.5–10%) of salt (NaCl) which is inhibitory to most bacteria - making MSA selective against most Gram-negative and selective for some Gram-positive bacteria (Staphylococcus, Enterococcus and Micrococcaceae) that tolerate high salt concentrations.

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