Serotyping was carried out to determine incriminated specie for Salmonella using Polyvalent O Antisera. Two seperate loopful of normal saline was placed on a clean glass slide after which a clean wire loop was used to take a small part of suspect colony grown overnight on nutrient agar and placed on both drops of the normal saline and thoroughly mixed. A loopful of the antisera was placed on one of the bacteria suspension while normal saline was placed on the other (control). Both bacteria suspensions were mixed using a sterile wire loop and gently tilted to observe for agglutination. Positive Salmonella spp. with somatic antigen is indicative of agglutination reaction.