"...antibiotic prescriptions (around 47 million per year) are given needlessly to people with viruses such as bronchitis and the common cold, as well as for ear and sinus infections and sore throats not caused by bacterial infections—meaning the Rx not only won't vanquish their illness, but can potentially build up antibiotic resistance, the St. Louis..."
http://www.newser.com/story/224535/a-third-of-antibiotic-prescriptions-are-inappropriate-cdc.html
Vk