“Microbiome in Health and Disease: Cross-Species, Cross-System Insights into Microbial Ecology, Host Immunity, and Therapeutic Intervention” is a hardcover academic volume that explores its subject in depth, the work of Prof. Bethapudi Aruna. The book pairs rigorous scholarship with a readable style suited to both study and reference. Aimed at students, researchers, and academic readers, it is published by Khushbu Publications, New Delhi, India, and released in 2026.