Elek's test
Elek's test or the Elek plate test is an "in vitro" test of virulence performed on specimens of "Corynebacterium diphtheriae" , the bacteria that causes diphtheria . 
<triplet> Corynebacterium diphtheriae <subj> diphtheria <obj> has effect <triplet> diphtheria <subj> Elek's test <obj> medical examinations <subj> Corynebacterium diphtheriae <obj> has cause