Herbal products and their oil extracts have been used for natural therapy as pharmaceuticals; however, only in recent years; aromatic plants and their extracts were introduced to the animal feeding (Awaad et al., 2014). Further complications arise because herbal products and their oil extracts feed additives may vary widely with respect to botanical origin, processing, and composition. Most studies investigated blends of various active compounds and reported their effects on production performance rather than the physiological impacts (Renata et al., 2012; Lee et al., 2013). Eventually; immunomodulated components strengthen the defense and immune mechanisms of the body and currently usable for stimulating the non-specific immune responsiveness in both the human and Veterinary Medical practice (Awaad et al., 1999). Peppermint and eucalyptus essential oils blend proved to have an immunostimulant effect on the humoral and cell mediated immune response against Newcastle disease in chickens (Awaad et al., 2009a). Their utility in modulating the immune response of immunocompromised birds after infection with infectious bursal disease virus (IBDV) and/or vaccination against IBDV as compared with untreated control groups was also evident (Awaad et al., 2009b). The present trial was dedicated to determine the possible modulating effects of usage of peppermint and eucalyptus essential oils in emulsifiers on broiler chickens infected with velogenic Newcastle disease virus (vVND).