A composition comprising a cohort of at least five isolated strains of Bifidobacterium longum selected from the group consisting of: Bifidobacterium longum ssp suis APC1461 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42832 on 29 September 2017; Bifidobacterium longum ssp longum APC1473 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42824 on 29 September 2017; Bifidobacterium longum ssp longum APC1476 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42825 on 29 September 2017; Bifidobacterium longum ssp longum APC1478 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42826 on 29 September 2017; Bifidobacterium longum ssp longum APC1480 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42827 on 29 September 2017; Bifidobacterium longum ssp longum APC1503 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42828 on 29 September 2017; Bifidobacterium longum ssp longum APC293 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42830 on 29 September 2017; Bifidobacterium longum ssp longum APC295 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42831 on 29 September 2017; Bifidobacterium longum ssp longum APC1462 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42833 on 29 September 2017; Bifidobacterium longum ssp longum APC1465 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42834 on 29 September 2017; Bifidobacterium longum ssp longum APC1464 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42839 on 5 October 2017; Bifidobacterium longum ssp longum APC1468 as deposited with the National Collection of Industrial and Marine Bacteria) under the Accession No. NCIMB 42840 on 5 October 2017; and Bifidobacterium longum ssp longum APC1504 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42841 on 5 October 2017. Bifidobacterium longum ssp suis APC1461 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42832 on 29 September 2017; Bifidobacterium longum ssp longum APC1473 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42824 on 29 September 2017; Bifidobacterium longum ssp longum APC1476 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42825 on 29 September 2017; Bifidobacterium longum ssp longum APC1478 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42826 on 29 September 2017; Bifidobacterium longum ssp longum APC1480 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42827 on 29 September 2017; Bifidobacterium longum ssp longum APC1503 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42828 on 29 September 2017; Bifidobacterium longum ssp longum APC293 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42830 on 29 September 2017; Bifidobacterium longum ssp longum APC295 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42831 on 29 September 2017; Bifidobacterium longum ssp longum APC1462 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42833 on 29 September 2017; Bifidobacterium longum ssp longum APC1465 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42834 on 29 September 2017; Bifidobacterium longum ssp longum APC1464 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42839 on 5 October 2017; Bifidobacterium longum ssp longum APC1468 as deposited with the National Collection of Industrial and Marine Bacteria) under the Accession No. NCIMB 42840 on 5 October 2017; and Bifidobacterium longum ssp longum APC1504 as deposited with the National Collection of Industrial and Marine Bacteria under the Accession No. NCIMB 42841 on 5 October 2017.