Describe the answer of all parts of the following questions

Question- You are an epidemiologist and have been called to the scene of a new outbreak of a disease. Disease Y is believed to be caused by a bacterium and involves abdominal cramps and diarrhea. The disease originated in a college dorm, although some commuter students and professors have also been infected.

Part 1- Analyze how you could use Koch's postulates to identify the cause of the illness.

Part 2- Once you have identified the bacterium responsible, what treatment plan would you propose? Would you recommend giving infected people antibiotics? Why or why not?

Part 3- How do you believe Disease Y is transmitted? What advice would you give the local health authorities on stopping or limiting the spread of Disease Y?

I want experts help to explore the use of Koch's postulates to identify the cause of the illness.