the structure of spirochetes, pale treponema. the causative agent of syphilis. infographics.

attack bacteria bacteriemia bacterium biology cell cure danger disease electron epidemic experiment fighting health human ill illness illustration infection macro medical medicine micro microbe microbiology microorganism microscope microscopic model motile pallidum parasitism pathogenic pathology pest science scientific sex sexually sick sickness spirochete std sti syphilis transmitted treponema type vector veneral