Which scientist is associated with aseptic surgery after Lister?

• A. Louis Pasteur
• B. Robert Koch
• C. Ignaz Semmelweis
• D. Florence Nightingale

Answer: (B)

The idea being tested is how aseptic surgery moved from practical antisepsis to a scientifically grounded approach. After Lister showed that using antiseptics reduces infection in operations, the next step was to understand precisely which microbes cause those infections and how to keep them out of surgical areas. Robert Koch’s work did exactly that: he identified the specific bacteria responsible for diseases and developed reliable methods to isolate and study them in pure culture. This gave surgeons a concrete, scientific basis for why sterile conditions matter in the operating room and how to achieve them, reinforcing and extending Lister’s practical methods. Pasteur helped establish germ theory, Semmelweis emphasized handwashing before Lister, and Nightingale improved hospital sanitation, but Koch connected the microbes directly to disease and sterile technique in surgery.