
Arkray Widal 'H' & 'O' Antigen (Tube) is a diagnostic kit used to detect antibodies against Salmonella bacteria in a patient's blood sample, aiding in the diagnosis of typhoid and paratyphoid fever. The kit uses stained Salmonella antigens (both 'O' and 'H') to identify specific antibodies, with the 'O' antigen detecting somatic antibodies and the 'H' antigen detecting flagellar antibodies.