1.   Although Pfizer continues to develop improved versions of its conventional antibiotics, it has aggressively sought out alliances with the new companies.

2.   He said he is filling more prescriptions of conventional antibiotics and that over-the-counter drugs remain as popular as ever.

3.   Once they form such colonies, the organisms are particularly resistant to conventional antibiotics.

4.   Such ulcers, which are a common complication of diabetes, can become resistant to conventional antibiotics when infected and can require amputation.

5.   The drug has proven safe and effective in animal studies, the companies said, and works in a way that is distinct from the function of conventional antibiotics.

6.   The need for new antibiotics is becoming increasingly urgent as misuse and overuse of conventional antibiotics has bred resistance in many common disease-causing bacteria.