Which of the following examples would best fall under the science of epidemiology?
1) Determining what water source in the county is contaminated with Cryptosporidium oocytes.
2) Determining what factors lead to oocyte formation by intestinal Cryptosporidium.
3) Determining what factors lead to the fastest Cryptosporidium growth rate.
4) Determining the best treatment for an individual infected with Cryptosporidium.