In Zoonosis, veterinarian Rut Tutusaus delves into how viruses, bacteria, and parasites cross between animals and humans, shaping our shared history and threatening our future. Blending clinical insights with scientific evidence, she reveals how climate change, environmental degradation, and human behavior foster emerging zoonotic threats. More than a catalogue of diseases, the book is a powerful call to embrace the “One Health” approach, recognizing the deep interconnection between human, animal, and environmental health.