Viruses and bacteria once thought vanquished are giving doctors and researchers fits as new drug-resistant and multi drug-resistant strains crop up.

Flu, staphylococcus aureus, tuberculosis and gonorrhea, to name a few, have rendered some of medical science?s best antibiotics and anti-virals impotent, according to the Centers for Disease Control and Prevention and other research institutes, and multiple strains of HIV have adapted to ignore treatments.