Color-enhanced scanning electron micrograph showing Salmonella Typhimurium (red) invading cultured human cells. (credit: Rocky Mountain Laboratories, NIAID, NIH) As soon as scientists figured out how to harness the power of antibiotic drugs, bacteria hit back. Following clinical trials of penicillin around 1941, doctors documented the spread of penicillin-resistant Staphylococcus aureus among hospital patients in 1942. […]
