In 1928, Scottish biologist Alexander Fleming made a groundbreaking discovery when he observed that a contaminating mold in a petri dish had killed off staphylococci bacteria. This mold was later identified as Penicillium notatum, leading to the development of penicillin, the world's first antibiotic. Fleming's discovery revolutionized medicine, providing a powerful tool to combat bacterial infections and saving countless lives. The introduction of penicillin marked the beginning of the antibiotic era, transforming healthcare and significantly reducing mortality rates from bacterial diseases.

Alexander Fleming's discovery of penicillin in 1928 revolutionized medicine and inspired poets to explore themes of healing and survival. This shift in the human relationship with disease influenced mid-century poetry, as writers began to reflect on the fragility of life and the hope offered by scientific advancements.