Penicillin was first discovered accidentally in 1928 and is now the most widely used antibiotic in the world.
Penicillin made a difference during the first half of the 20th century. The first patient was successfully treated for streptococcal septicemia in the United States in 1942. However, supply was limited and demand was high in the early days of penicillin.
Penicillin helped reduce the number of deaths and amputations of troops during World War II. According to records, there were only 400 million units of penicillin available during the first five months of 1943; by the time World War II ended, U.S. companies were making 650 billion units a month.
To date, penicillin has become the most widely used antibiotic in the world.