MeSH definition : Gram-negative bacteria isolated from infections of the respiratory and intestinal
tracts and from the buccal cavity, intestinal tract, and urogenital tract. They are
probably part of the normal flora of man and animals.;
Gram-negative bacteria isolated from infections of the respiratory and intestinal
tracts and from the buccal cavity, intestinal tract, and urogenital tract. They are
probably part of the normal flora of man and animals.