<prompt> Scrub typhus is positive forOX KOX 2OX K and OX 19OX 19 only  <response>: Scrub typhus aka chigger borne typhus is caused by orientia tsutsugamushi.In a heterephile agglutination testweil Felix reaction, the sera of scrub typhus patients agglutinated only OX K strain of proteins mirabilis without getting agglutinated with OX 19 and OX 2 ...as some rickettsiae and ceain strains like OX K ,OX 19 and OX 2 of proteus share alkali stable carbohydrate antigen Ref: Ananthnarayan and panikers microbiology 10th edition 