More about Microbes

http://www.microbeworld.org/microbes/virus/

http://faculty.ccbcmd.edu/courses/bio141/lecguide/unit1/prostruct/gncw.html
Site gives a detailed structure of a gram negative bacteria and then goes on to explain it's role in initiating immunological defenses within the body.

http://student.ccbcmd.edu/courses/bio141/lecguide/unit1/prostruct/gpcw.html
Same as above, except for gram positive bacteria.

http://nobelprize.org/educational_games/medicine/immunity/immune-detail.html