Published online by Cambridge University Press: 15 May 2009
1. Direct conglutination has been demonstrated with Rickettsia burneti.
2. Sera from human volunteers inoculated with killed suspensions of R. burneti and from persons who had recovered from an attack of Q fever as well as sera from a small number of healthy blood donors were all examined by the direct conglutination reaction, the haemolytic-complement fixation test and the direct agglutination test. A good correlation was found between the titres of the direct conglutination reaction and the haemolytic complement-fixation test but the results with the direct agglutination test were unreliable.