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51) This is usually the first bacteria that a baby encounters as it passes through the birth canal A) E. coli B) L. lactis C)
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Answer: B) L. lactis

Explanation: Lactobacilus lactis harbour the birth canal during labour, when a baby passes through the birth canal, it encounters the Lactobacillus lactis, as the first bacteria. These bacteria train the immune system of the baby to become immunotolerant towards the self-microbiota.

No other bacteria given in the other options are the one that the baby encounters first while passing down the birth canal. Thus, all other options are incorrect.

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