Furazolidone susceptibility testing differentiates which two genera?

Furazolidone susceptibility testing differentiates which two genera?

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

Answer: (A)

Furazolidone susceptibility testing is used to separate two closely related Gram-positive cocci by how they respond to the drug. Micrococcus species are inhibited by furazolidone, producing a clear zone around the disk, whereas Staphylococcus species are resistant and continue to grow up to the disk. This difference in susceptibility provides a practical way to distinguish these two genera in the lab. The test isn’t used to differentiate Staphylococcus from Pseudomonas or Streptococcus from Micrococcus, because their responses to furazolidone don’t give a reliable separation.

Furazolidone susceptibility testing is used to separate two closely related Gram-positive cocci by how they respond to the drug. Micrococcus species are inhibited by furazolidone, producing a clear zone around the disk, whereas Staphylococcus species are resistant and continue to grow up to the disk. This difference in susceptibility provides a practical way to distinguish these two genera in the lab. The test isn’t used to differentiate Staphylococcus from Pseudomonas or Streptococcus from Micrococcus, because their responses to furazolidone don’t give a reliable separation.