Aflatoxins (AFs), potent mycotoxins produced by the fungi Aspergillus flavus and Aspergillus parasiticus, are a major concern in poultry production. AF contamination causes reduced animal efficiency, increased susceptibility to environmental and microbial stresses and reduction of immune function (Miazzo et al., 2000). Different approaches such as the use of mold inhibitors, fermentation, physical separation, irradiation, ammoniation and ozone degradation have been used to prevent food contamination by AFs. Unfortunately, most of these procedures are expensive, time-consuming and only partially effective. Currently, the most promising and practical approach has been the addition of adsorbents (Mycozorb and aluminosilicates) to contaminated feeds to selectively bind the aflatoxin molecule. So far, the effects of aflatoxin adsorbents have not been evaluated on antibody titres of chickens. The purpose of this study was to evaluate the effects of sodium bentonite and a commercial yeast cell wall product (MycosorbTM) on antibody titres against Newcastle and Infectious bursal diseases of chickens fed rations containing AF.