Word: bacteria
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...point is that antibiotic use in different places is very likely driving substantial differences in which bacteria have resistance and which don’t have resistance,” said Marc Lipsitch, a researcher at the SPH and a co-author on the study...
This most likely occurs, according to McCormick, because the use of antibiotics to treat illness puts pressure on the population of bacteria that inhabit treated humans...
Heavy use of antibiotics causes more bacteria without the resistance to die than those with resistance, resulting in a growing proportion of bacteria that are resistant to whatever antibiotics are being used—a trait they can pass on to their offspring, she said...
Lipsitch said that the bacteria they studied is very common...
...Somewhere between 30 and 100 percent of kids less than five have it at any given time,” he said, adding that the percentage decreases slightly in later years because of better hygiene and a new vaccine for children against some strains of the bacteria that was approved...