11.   Both Mayon-White and Wise say that vancomycin should only be used to prevent life-threatening MRSA infections, not C. difficile.

12.   Drugs used to prevent rejection of transplanted organs weaken the immune system and make recipients more vulnerable to infections.

13.   Elaborate banding systems similar to those at the University of Virginia hospital are widely used to prevent baby switches and abductions, hospital officials say.

14.   Every month, Babyock goes to the medical center to inhale a mist of pentamidine, a drug used to prevent AIDS pneumonia.

15.   Every mechanic knows that a ratchet is a toothed wheel or bar used to prevent a gizmo from moving backward.

16.   For the first time, photo credentials, computerized registration lists and indelible ink were used to prevent fraud.

17.   Fung also was challenged about his knowledge of proper techniques used to prevent evidence contamination when collecting blood for DNA testing.

18.   Furthermore, the drugs used to prevent HIV infection are the same combinations that are now proving very effective in the early treatment of HIV infections.

19.   Genzyme Surgical Repair sells the Seprafilm product used to prevent postsurgical adhesion between organs.

20.   He and his colleagues hope to develop designer composts, mixes of farm, industrial and urban materials that can be used to prevent particular diseases in crops.