A. Because it can be transmitted from a mosquito, so that would be a type of animal, and as human beings, we all have it in our intestines. Large intestine I believe
B. Because it can be transmitted from one person to another by a mosquito.
C. Because it can be in food. There have been many recalls of contaminated food. I believe the one from E-Coli a few years ago was from lettuce.
I am sure about these 3, but it <em><u>could</u></em> also be D.
