Table 2.

Occurrence of butyrate-producing and acetate-consuming strains in six human fecal samples

IndividualcSampleButyrate production (mM) among human fecal isolates numbering:No. (%)a of strains showing net consumption of acetateb among strains producing:
0–2.02.1–5.05.1–10.010.1–15.0>15.0>2 mM butyrate<2 mM butyrate
Infant15054715/160/5
26394407/172/63
Adult A115111005/120/15
255885310/240/55
Adult B12520000/20/25
27630000/30/76
 Total2393318131037/74 (50)2/239 (1)
  • a Number of strains relative to total numbers. N.B., most (90%) strains not showing acetate consumption produced more than 2 mM acetate.

  • b Defined as >2 mM acetate, net.

  • c Adult A is omnivorous; adult B is vegetarian.