title: Effects of antimicrobial prophylaxis on colonization resistance.
abstract: The effect of antimicrobial agents on the intestinal microflora of patients undergoing colorectal surgery was examined. Two narrow spectrum agents, clindamycin and aztreonam, disturbed colonization resistance. This was preserved with the broad spectrum compound, imipenem. Ecological effects are difficult to predict and clinical studies of new antibiotics should include investigations of their impact on the normal human intestinal flora.
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D001398:Aztreonam / Q000627:therapeutic use; D001419:Bacteria / Q000187:drug effects*; D015377:Cilastatin; D000077728:Cilastatin, Imipenem Drug Combination; D002981:Clindamycin / Q000627:therapeutic use; D003106:Colon / Q000382:microbiology*; D003521:Cyclopropanes / Q000627:therapeutic use; D004338:Drug Combinations / Q000627:therapeutic use; D005260:Female; D006801:Humans; D015378:Imipenem; D008297:Male; D008875:Middle Aged; D011292:Premedication; D013845:Thienamycins / Q000627:therapeutic use
chemical_list: D000900:Anti-Bacterial Agents; D003521:Cyclopropanes; D004338:Drug Combinations; D013845:Thienamycins; D015377:Cilastatin; D002981:Clindamycin; D015378:Imipenem; D000077728:Cilastatin, Imipenem Drug Combination; D001398:Aztreonam