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Treponema pallidum bacteria Treponema pallidum bacteria Treponema pallidum bacteria Treponema pallidum bacteria Treponema pallidum bacteria cancer cell in blood stream red blood cell illustration red blood cell illustration red blood cell illustration HIV virus , artwork HIV virus , artwork HIV virus , artwork HIV virus , artwork HIV virus , artwork HIV virus , artwork HIV virus , artwork Illustration of bacteria cells Illustration of bacteria cells Illustration of bacteria cells Illustration of bacteria cells Illustration of bacteria cells Illustration of bacteria cells Illustration of bacteria cells Illustration of bacteria cells Illustration of bacteria cells Illustration of bacteria cells Illustration of bacteria cells Illustration of bacteria cells Illustration of bacteria cells Illustration of bacteria cells