This reference work covers general concepts of anti-viral metabolites, classifications, ethnopharmacology, chemistry, clinical and preclinical studies focusing on different medicinal plants against various types of viral infections. Various plants have been used in medicine since ancient times and are known for their strong therapeutic effects. The book will describe potential antiviral properties of medicinal plants against a diverse group of viruses, and provide an insight to the potential plants possess for broad-spectrum antiviral effects against emerging viral infections. The book aims to target a broad audience including virologists, molecular biologist, microbiologist and scientists working with natural products as well as researchers, students, healthcare experts involved in pharmaceutical and medical field.