The Weil Felix test aids in rickettsial illness diagnosis. Anti-rickettsial antibodies that have been detected in a patients blood sample are its goal. Only 510 days after the commencement of the disease may a enough detectable quantity of antibodies be developed for a positive outcome. To confirm the diagnosis a second titer taken seven to fourteen days following the first may be used. A collection of bacterial illnesses known as rickettsial infections which can spread through fleas mites or lice include typhus rickettsialpox spotted fever and others.