The World Health Organization warned Tuesday that antimicrobial resistance is already causing a global health emergency, threatening to erase nearly a century of medical progress as common infections become increasingly challenging to treat.Saia Ma'u Piukala, the WHO regional director for the Western Pacific, said in a statement released Tuesday that the discovery of antimicrobials almost a century ago changed the course of modern medicine.But that is changing, he said, due to misuse and overuse of these medicines, bacteria, viruses, fungi and parasites are quickly changing and becoming resistant to antimicrobials.One in six bacterial infections worldwide now resists standard antibiotics, Piukala...