Patient came from Nagaland and shows positive test with OXK antigen. Diagnosis is-
Trench fever
Scrub typhus
Endemic typhus
Epidemic typhus
Ans. is 'b' i.e., Scrub typhus Weil felix reactiono This reaction is an agglutination test in which sera are tested for agglutinins to O antigens of certain nonmotile proteus strains OX - 19, OX - 2 and OX - K.o The basis of the test is the sharing of an alkali - stable carbohydrate antigen by some rickettsiae and by certain strains of proteus, P vulgaris OX - 19 and OX - 2 and P mirabilis OX - K.o The test is usually done as a tube agglutination, though rapid slide agglutination methods have been employed for screening.Weil feiix ReactionDiseaseOX-19OX-2OX-KRocky Mountain spotted fever++-Rickettsia] pox---Epidemic typhus+--Bril - Zinsser disease+/---Scrub typhus--+Endemic typhus+--Trench fever---Q fever---
Bacteria