This is a four page document. Page one is a blank diagram of the Disease Transmission Cycle. Page two is a blank diagram of important vocabulary words in my Disease unit. Page three is the answer key for the D.T.C. diagram. Page four is the answer key for the vocabulary words. I printed page one and two on a double-sided sheet of paper prior to giving it to my students. Then, I asked my students to use this worksheet as guided notes while we covered this information in the Disease unit.