corynebacterium bacteria, gram-positive rod-d bacterium that causes diphtheria

diphtheria infection bacteria corynebacterium bacterium respiratory microscopic illustration diphtheriae micro microbe microbiology microorganisms tonsils rodshaped medicine science scientific sick organism macro closeup 3d microscope human biology bugs disease ulcerans illness grampositive fever vaccine weapon experiment attack biological pathology health tetraxim epidemic diphtheroid nondiphtheria pseudotuberculosis amycolatum jeikeium joint endocarditis white background isolated