“A Mr. X who suffers from a sore throat takes some penicillin. The dose is not sufficient to eradicate the streptococci but enough to make them resistant to penicillin. His wife picks up the bug, and she comes down with pneumonia. Mrs. X is treated then with this wonder drug, penicillin. As the streptococci are now resistant to penicillin, the treatment fails, and, unfortunately, Mrs. X dies.”