Many bacteria are necessary for normal function of daily living.
In fact, certain kinds of bacteria are essential or our survival because they help digest food or hinder the growth of infectious organisms. Because bacteria grow by dividing, antibiotics may be required to kill harmful bacteria which can cause infections such as respiratory infections like bronchitis and pneumonia. Simply put, antibiotics either kill or prevent the growth of bacteria, thus resulting in the elimination of the harmful bacteria. Different classes of antibiotics act on bacteria in different ways. According to the Centers for Disease Control and Prevention, there are aver 3,000 annual deaths resulting from bronchitis in the United States.