ABSTRACT
Recent outbreak of novel coronavirus COVID 19 as pandemic has threatened mankind and revealed the drawbacks in medical science. Finding innovative ways to treat a disease without generating resistance in pathogens is the need of the hour. Probiotics are commensal microorganisms that reside in the body and confer health benefits to the host. Till date, they have been used merely as food supplement that would enhance digestion. But research shows that they also have effects on the immune system of their host and can be used effectively as an immunomodulator in several diseases like bacterial, viral, cancerous, and autoimmune disorders. This chapter gives a brief insight into the role played by probiotics in enhancing immune response against the cited diseases. © 2023 Elsevier Inc. All rights reserved.