The serology is used as most common diagnostic modality for enteric fever. Slide Widal test is a rapid test and thus used as screening tool. Due to rapidity in availability of results of slide Widal test diagnosis being made solely on its basis in most of the laboratories. Hence based on above findings the present study was conducted to know the efficacy and diagnostic reliability of the slide Widal test in comparison to tube Widal test. The present study was conducted in Department of Microbiology, Anugrah Narayan Magadh Medical College, Gaya for the duration of 4 months from March 2018 to July 2018. The patients suspected as having enteric fever during the study period were included in the study. The serum was separated from each blood sample following all standard precautions. The sera were then subjected to the Widal test by the slide agglutination method. From the present study it can be concluded that Widal test is the common test used for diagnosis of the enteric fever in developing countries. The slide agglutination test can be used as screening tool and the positive results should be confirmed by the tube agglutination test.