"L. reuteri persisted at reduced but detectable levels 4 weeks after the end of intake"
Not sure if you know what persisted means. I have no idea if English is your first language. Here's the definition.
Persist - 1) To continue in existence; last, 2) to continue to exist or occur without interruption, 3) to continue to exist especially past a usual, expected, or normal time.
The quote you gave shows that probiotic bacteria CAN colonize the digestive tract, and persist even 4 weeks after stopping the supplementation.
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