11.   When a product is overused, it hastens the evolutionary process by which bacteria develop defenses against agents designed to kill them.

12.   However, antibiotics, used against acne for three decades, are losing their power as acne bacteria develop resistance.

13.   In the meantime, antibiotics and other life-saving drugs used to fight disease are fast losing their effectiveness as bacteria develop resistance to them.

14.   Antibiotics and other life-saving drugs used to fight disease are fast losing their effectiveness as bacteria develop resistance to them, the World Health Organisation warned Monday.

15.   Dr. Alison McGeer, an infectious disease specialist at Mount Sinai, said the bacteria had developed their resistance to antibiotics in the United States.