21.   Researchers knew that certain bacteria have natural chemicals that block those toxic effects, called antagonists.

22.   The more often an antibiotic is used, the more chances bacteria have to evolve ways to evade it.

23.   The state Fisheries Directorate on Friday said it feared the bacteria could have spread to fishing boats that bought ice produced from contaminated water.

24.   The trailblazing experiment is fuelling hopes the prehistoric bacteria will have applications in killing other bacteria harmful to mankind.

25.   The bottles were difficult to clean properly, and bacteria causing gastroenteritis had a field day.