explain how ecoli can cause people to get sick

Describe how bloodborne, airborne, and food-borne diseases are transmitted, and give an example of each type of transmission.

New research suggests a link between some microbes that normally live in the body and seemingly unrelated major illnesses. The gum disease called periodontitis itself is not life-threatening, for instance, but it is a fairly good predictor for heart attacks. Bacteria that cause gum disease can trigger inflammation. Thinking back to your reading in Chapter 7, how do you suppose that this response also may be harmful to the heart?

Explain the reason why the imprudent and excessive use of antibiotics has resulted in a major global problem.