Furazolidone susceptibility differentiates which two genera?

Furazolidone susceptibility differentiates which two genera?

• A. Staphylococcus from Micrococcus
• B. Staphylococcus from Psuedomonas
• C. Streptococcus from Micrococcus
• D. Staphylococcus from Streptococcus

Answer: (A)

Furazolidone susceptibility is used to separate two genera of Gram-positive cocci that can look similar on routine culture. Micrococcus species are inhibited by furazolidone, producing a clear zone around the disk, whereas Staphylococcus species are resistant and show little to no inhibition. Because of this distinct response, furazolidone testing effectively differentiates Staphylococcus from Micrococcus. In practice, a furazolidone disk is placed on a bacterial lawn and incubated; a zone of inhibition indicates Micrococcus, while no zone points to Staphylococcus.

Furazolidone susceptibility is used to separate two genera of Gram-positive cocci that can look similar on routine culture. Micrococcus species are inhibited by furazolidone, producing a clear zone around the disk, whereas Staphylococcus species are resistant and show little to no inhibition. Because of this distinct response, furazolidone testing effectively differentiates Staphylococcus from Micrococcus. In practice, a furazolidone disk is placed on a bacterial lawn and incubated; a zone of inhibition indicates Micrococcus, while no zone points to Staphylococcus.