Respecting the fact that it is very rare to recover adult worms or larvae from stool or other body fluids even if the patient has diarrhea, it was very important to find an accurate methods of laboratory diagnosis to over come the unreliability of the direct laboratory methods and the hazards of muscle biopsy examination, therefore the importance of the serological tests for detection of Trichinella- spiralis antibodies in the sera of the suspected cases emerges (van Knapen et al., 1981). Both crude larval antigen and excretory -secretory antigens were found to be highly specific for detection of Trichinella-spiralis antibodies in serum (Taylor et al., 1980). Each test gives different degrees of sensitivity and specificity.