The Arkray Febrile S.Typhi AG Set H,O,A(H)&(H) (4x50ml) is a Widal test kit containing four types of Salmonella antigens in 50ml vials: S. Typhi 'H', S. Typhi 'O', S. Paratyphi A(H), and S. Paratyphi B(H). It's used for the serological diagnosis of typhoid fever by detecting corresponding antibodies in a patient's blood via agglutination reactions in slide or tube tests. The kit is characterized by uniform clump formation, uncompromised sensitivity and accuracy, and a long shelf life of 18 months, with reagents supplied in USP type 1 amber-colored glass vials.