The Work of Lister, Nightingale, and Semmelweis All Contributed to Controlling

The work of Lister, Nightingale, and Semmelweis all contributed to controlling infectious disease by

A) developing methods for reducing nosocomial infections.
B) developing techniques for isolating pathogens.
C) identifying the sources of infectious agents.
D) developing vaccines.
E) determining the taxonomic relationships among microbes.