Okuduğunu Anlama Test 4

Passage

In 1928, Scottish bacteriologist Alexander Fleming made a discovery that would transform modern medicine. While examining petri dishes containing Staphylococcus bacteria in his laboratory at St Mary's Hospital in London, he noticed that a mould called Penicillium notatum had contaminated one of the dishes. Rather than discarding it, Fleming observed something remarkable: the bacteria surrounding the mould had been destroyed. He hypothesised that the mould was producing a substance that killed bacteria, which he named penicillin. Despite the significance of this observation, Fleming lacked the resources and chemical expertise to purify and mass-produce penicillin. The compound remained largely a laboratory curiosity for over a decade. It was not until 1940 that Howard Florey and Ernst Boris Chain, researchers at the University of Oxford, successfully developed methods to purify penicillin in sufficient quantities for clinical trials. Their initial tests on human patients yielded extraordinary results -- infections that had been considered fatal were cured within days. The outbreak of World War II created an urgent demand for effective treatments for infected wounds on the battlefield. The British and American governments invested heavily in scaling up penicillin production. By 1944, enough penicillin was being manufactured to treat all Allied soldiers wounded during the D-Day invasion of Normandy. It is estimated that penicillin saved the lives of tens of thousands of soldiers during the war. In 1945, Fleming, Florey, and Chain were jointly awarded the Nobel Prize in Physiology or Medicine. In his acceptance speech, Fleming presciently warned that the overuse of antibiotics could lead to resistant bacteria. He stated that a person who 'plays with penicillin treatment' by using doses that are too low could inadvertently cultivate resistant organisms. Decades later, antimicrobial resistance has emerged as one of the gravest threats to global health, vindicating Fleming's early concerns. The legacy of penicillin extends far beyond the antibiotic itself. It inaugurated the era of antibiotic medicine, leading to the development of hundreds of subsequent antimicrobial agents. Prior to penicillin, a simple scratch could prove fatal if it became infected. Today, antibiotics underpin virtually every aspect of modern healthcare, from routine surgeries to cancer chemotherapy, which suppresses the immune system and leaves patients vulnerable to infections that only antibiotics can treat.