Viruses are responsible for:
Antibiotics can help you get better if a bacterial infection causes your illness, but they'll have no effect at all if you have a virus. What's more, taking antibiotics when you don't need them can lead to germs that are antibiotic-resistant.
Frequent and inappropriate antibiotic use leads to the development of antibiotic-resistant bacteria. When bacteria outsmart standard antibiotics, you need stronger and more costly medications to treat infections. Because bacteria mutate much more quickly than researchers can develop new antibiotics, the possibility exists that one day soon highly lethal strains of resistant bacteria will evolve — and there won't be effective drugs to kill them.
I'm convinced the doctor I saw recently, was out to make money. :P