The book is written for undergraduates, post-graduates, and doctoral students interested in bifidobacterial biology. ... This is an excellent book that provides comprehensive information about bifidobacteria, which are normal inhabitants in the gastrointestinal tracts of mammals, especially as nurslings, birds, and certain cold-blooded animals. ... this book will appeal to the intended audience who will find it very interesting and informative. (Omer Iqbal, Doody's Book Reviews, April 23, 2021)