Final answer:
Manuela would find the most comprehensive information about the life-saving impact of penicillin in a textbook chapter titled "Penicillin and Modern Medicine," which provides historical context and statistics regarding the drug's widespread use and effect on mortality rates from infectious diseases.
Step-by-step explanation:
Manuela would find the most information about how many lives were saved by penicillin in a textbook chapter titled "Penicillin and Modern Medicine." This chapter is likely to contain detailed historical information and statistics regarding the impact of penicillin since its discovery in medical history, including its role during World War II and its contribution to reducing mortality rates from various infections. While lists of doctors or a website focusing on risks and warnings may provide some insight, and a biography of an engineer would be too specific and not relevant to medical treatments, a textbook about modern medicine will offer a comprehensive overview of penicillin's life-saving impacts historically.
The story of penicillin begins with Alexander Fleming's accidental discovery due to a mold that grew on a petri dish. The subsequent isolation, mass production, and widespread use of penicillin have contributed immensely to controlling infectious diseases such as pneumonia, which was once a significant cause of death. Despite the modern challenge of antibiotic-resistant strains, the development of penicillin has been a critical factor in extending longevity and improving global health.