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Why does urine culture show different bacteria?

One has done two times of urine culture test. The first time it shows E-coli >=10,000 cfu/ml and one of antibiotic Ampicillin is Resistant >=32. A few years late the second time of urine culture does not show E-Coli but Enterococcus 1,000 – 10,000 cfu/ml and the same antibiotics Ampicillin changes to Sensitive <= 2.  
Why does two urine culture show different bacteria? Is it due to only one bacteria is detectable while others do not exist in a given urine culture test or it is due to the lab checks only ONE specific bacteria? Thank you for your answer.
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20620809 tn?1504362969
Well, it is a year or a few years later, right?  Those are two common pathogens they find with urinary tract infections.  Both are semi related to fecal matter so work hard on hygiene to make sure that is not getting into your urinary tract.  
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