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Spirochetes and Genus Treponema
• Thin, regular, coiled cells
• Live in the oral cavity, intestinal tract, and perigenital regions of humans and animals
• Pathogens are strict parasites with complex growth requirements
• Require live cells for cultivation
Treponema Pallidum
Causes Syphilis
Human is the natural host
Extremely fastidious (hard to grow) and sensitive; cannot survive long outside of the host
Sexual and transplacental transmission (crosses the placenta)
Primary Syphilis
Initial appearance of chancre at inoculation site
Intense treponemal activity in body
Chancre later disappears
Secondary Syphilis
Spirochete is multiplying in the bloodstream
Rash forms on the skin, palms and soles with fever, headache and sore throat
Rash does not hurt or itch
Can persist for months
Disappears spontaneously