Who identified the link between handwashing and the spread of disease?

Who identified the link between handwashing and the spread of disease?

• A. Louis Pasteur
• B. Joseph Lister
• C. Robert Koch
• D. Ignaz Semmelweis

Answer: (D)

Understanding how hand hygiene stops disease spread is illustrated by Ignaz Semmelweis, who in the 1840s observed that mortality from puerperal fever was much higher in women attended by physicians who had just come from performing autopsies than in those attended by midwives. He proposed that "cadaver particles" were carried on hands and introduced a simple practice: wash hands with a chlorinated lime solution before examining patients. After enforcing this, mortality dropped dramatically, showing that preventing the transfer of infectious material could reduce disease spread even before the germ theory was widely accepted. While Pasteur helped establish germ theory and Lister introduced antiseptic techniques in surgery, neither pinpointed the early, hospital-based link between handwashing and reducing patient infections. Koch contributed to identifying specific pathogens and the basics of disease causation. The act of handwashing reducing disease transmission, demonstrated by Semmelweis, is the defining moment here.

Understanding how hand hygiene stops disease spread is illustrated by Ignaz Semmelweis, who in the 1840s observed that mortality from puerperal fever was much higher in women attended by physicians who had just come from performing autopsies than in those attended by midwives. He proposed that "cadaver particles" were carried on hands and introduced a simple practice: wash hands with a chlorinated lime solution before examining patients. After enforcing this, mortality dropped dramatically, showing that preventing the transfer of infectious material could reduce disease spread even before the germ theory was widely accepted.

While Pasteur helped establish germ theory and Lister introduced antiseptic techniques in surgery, neither pinpointed the early, hospital-based link between handwashing and reducing patient infections. Koch contributed to identifying specific pathogens and the basics of disease causation. The act of handwashing reducing disease transmission, demonstrated by Semmelweis, is the defining moment here.