“…The phylum Actinobacteria also comprises, among others, Actinomycetaceae, propionibacteria, corynebacteria, mycobacteria and streptomyces [103,149]. Thirty-nine species have been assigned to the genus Bifidobacterium, including recent additions such as Bifidobacterium tsurumiense [91] isolated from hamster dental plaque, Bifidobacterium mongoliense isolated from airag, a traditional Mongolian fermented horse milk product [160], Bifidobacterium crudilactis extracted from French raw milk and raw milk cheeses [20], Bifidobacterium psychraerophilum, originating from pig intestine [128], and three bifidobacterial species, Bifidobacterium bombi [52], Bifidobacterium actinicoloniformis and Bifidobacterium bohemicus [51], isolated from the digestive tract of different bumblebee species (Table 1). Furthermore, it seems that many bifidobacteria are still to be discovered as suggested by various metagenomic studies [11,137].…”