An army jawan posted in a remote forest area had fever of 104F and headache. On examination he had an erythematous lesion of about 1 cm on the leg surrounded by small vesicles, along with generalized lymphadenopathy. His blood sample is collected to perform serology for the diagnosis of Rickettsial disease. Which one of the following results in Weil-felix reaction will be helpful in diagnosing this condition?