The present invention relates to composition essentially consisting of Hafnia alvei probiotic strain expressing the ClpB protein; wherein the ClpB protein is in an amount of at least 0.7% (w/w) in weight relative to the total weight of the composition; and the ratio of the total number of Hafnia alvei colony forming units to the total Hafnia alvei cell number ranges from 10-4 to 0.8. The invention further relates to oral dosage forms, namely gastro-resistant capsules comprising the composition of the invention.

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