2.3.2. Fecal Sample Collection
STERILE
Fecal samples were collected from infants at home by their parents or guardians during the 24 h before the baseline and at week 4, 8, and 12 visits. Samples were collected with a scoop attached to a sterile plastic collection tube. After collection, the tubes were immediately stored in a −20 °C freezer, transported to the laboratory within 1 day, and stored at −80 °C until processing.