IELTS Reading: Matching Features

The story of antibiotics begins not with a single discovery but with a series of breakthroughs made by different scientists working across several decades. Alexander Fleming, a Scottish bacteriologist, made the pivotal observation in 1928 when he noticed that a contaminating mould — later identified as Penicillium notatum — had created a clear zone around itself on a bacterial culture plate, suggesting it was producing a substance lethal to bacteria. Although Fleming recognised the significance of this finding and published his results, he was unable to purify the active compound, and his work attracted limited interest at the time. It was not until the late 1930s that the potential of penicillin was fully realised. Howard Florey, an Australian pharmacologist working at Oxford, assembled a team that included the German-born biochemist Ernst Boris Chain. Together, Florey and Chain developed methods to extract and concentrate penicillin in quantities sufficient for clinical testing. Their landmark 1941 trial demonstrated that penicillin could cure life-threatening bacterial infections in humans. Both men, together with Fleming, were awarded the Nobel Prize in Physiology or Medicine in 1945. Meanwhile, a parallel story was unfolding in the United States. Selman Waksman, a Ukrainian-born soil microbiologist at Rutgers University, had long believed that soil microorganisms were a rich source of antibacterial compounds. His systematic screening of actinomycetes — a group of bacteria found in soil — led in 1943 to the isolation of streptomycin, the first antibiotic effective against tuberculosis, a disease that had previously been untreatable. Waksman received the Nobel Prize in 1952, and it was he who coined the term "antibiotic" to describe such naturally occurring microbial compounds. Paul Ehrlich, a German physician working in the early twentieth century, predates these discoveries yet can rightly be called the father of chemotherapy. Ehrlich's concept of a "magic bullet" — a chemical agent that could kill pathogens without harming the host — led to the synthesis of Salvarsan in 1909, the first modern antimicrobial drug, used to treat syphilis. Although Salvarsan was a synthetic compound rather than a natural antibiotic, Ehrlich's work established the theoretical framework upon which all subsequent antibiotic research was built.