the results were evaluated on the basis of : 1 ) clinical observations , 2 ) necropsy observations , 3 ) counts of viable e. coli in segments of the small intestine , 4 ) attempts to isolate e. coli from the heart , liver , and bile , 5 ) microscopic examination of fixed intestinal sections to determine the location of e. coli and morphologic evidence of the host response , and 6 ) determination of the ph of the various portions portions of the gastrointestinal tract .
C0021852
small intestine
C0021853
intestinal