“…Herbal drugs are known to possess immunomodulatory properties and generally act by stimulating both specific and non-specific immunity [146] [147] In the past few years the medicinal plants investigated for their immunostimulatory response on fish include Ocimum sanctum, Acalypha indica, Phyllanthus niruri, Phyllanthus emblica, Azadirachta indica, Crossandra infundibuliformis, Aloe vera, Curcuma longa, Solanum trilobatum, Piper betle, Murraya koenigi, and Mentha piperita [153], turmeric [20]; Chinese herbs Astragalus membranaceus, Polygonum multiflorum, Isatis tinctoria, Glycyrrhiza glabra, Lonicera japonica [154] [155], Massa medicata, Crataegi fructus, Scutelaria baicalensis, Artemisia capillaries, Cnidium officinale [156]. The immunomodulatory properties of Holi Basil, Tulsi (O. sanctum) have been studied in detail by many workers [157] [158] [159] [160], Das et al [144].…”