In his laboratory he watched as succeeding generations of Staphylococcus aureus (hospital staph) developed cell walls increasingly impervious to the drug that he had discovered.
Di laboratoriumnya, ia mengamati seraya generasi - generasi penerus dari Staphylococcus aureus (stafilokokus rumah sakit) mengembangkan dinding - dinding sel yang semakin kebal terhadap obat yang telah ia temukan.