A female prisoner developed an acute febrile illness after three weeks of her imprisonment. She visited the prison clinic for help. A physician suspected for epidemic typhus and requested for serological Weil-Felix test and the laboratory technologist conducted the test for confirmation. What type of antigen could be most likely used as a reagent for the test? a. Salmonella somatic antigen b. Chlamydia somatic antigen c. Rickettsia somatic antigen d. Proteus somatic antigen
