Abstract : Some of the most dreaded past plagues have been infectious illnesses that have emerged throughout history. Many of the previous plagues are still with us today, and new diseases are continuously emerging. These are global problems and are responsible for most of the deaths throughout the world. Plants have long been a prominent reservoir of medicinal substances, providing humans with medicines since the earliest times. The World Health Organization (WHO) finds that over eighty percent of people exclusively depend on phytochemical-based herbal medicines. These are naturally occurring, non-essential, bioactive nutrients. A substantial quantity of these compounds can be found in vegetables (cabbage, tomato, carrot, cauliflower, kale, bean, potato, and soybean), fruits (grapes, apples, apricots, cherries, berries, oranges, and peel of citrus fruits), cereals, whole grains, nuts, green tea, and seeds. They also protect human health from potential hazards. Despite the widespread use of antibiotics to treat infectious illnesses, the advent of multi-drug-resistant bacteria emphasizes the necessity of novel therapies. Antibiotics, meanwhile, can disrupt the equilibrium of intestinal microbes in a clinical setting, which is detrimental to the recovery of infectious diseases. Consequently, recent research has initiated an investigation into potential preventive and therapeutic approaches for infectious diseases, commencing with dietary fiber, selenium, antioxidants, tea, polyphenols, and probiotics that are more easily obtainable. In this report, an effort has been made to emphasize the potential of several dietary phytochemicals in managing a wide range of infectious diseases.

Keyword : Infectious Diseases, Phytochemicals, Polyphenols, Probiotics, World Health Organization