BEACON Widal Negative Control is a negative control solution designed to ensure the absence of cross-reactivity or false positive results in the Widal serological test used to detect Salmonella typhi-paratyphi infections. The negative control solution helps verify that the test results are truly due to a specific reaction with the antigen, and not caused by contamination or technical errors. This product is recommended for use in a clinical lab environment by professionals. PT Isotekindo Intertama is the official distributor and registered with the Ministry of Health Republic of Indonesia.