campylobacter jejuni bacteriatreatment for campylobactercampylobacter pathogencampylobacter ureolyticussalmonella and campylobactershigella campylobactercampylobacter bacterial infectioncampylobacter and helicobactercampylobacter jejuni treatmentsalmonella shigella campylobactercampylobacter colicampylobacter intestinal infection