Salmonella typhi O

Febrile diseases diagnostic may be assessed either by microorganism isolation or by titration of specific antibodies, somatic (O) and flagellar (H) . The detection of these antibodies forms the basis for the long established Widal test. This test dedicates that a serum with high levels of agglutinating antibodies to O and H >1/100 is indicative of the infection with these microorganism.