The use of Salvarsan and Prontosil to treat microbial infections were early examples of

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Salvarsan and Prontosil were the precursors to modern-day chemotherapy, making them an early example of the use of chemical agents to selectively target and destroy cancer cells or microbial pathogens. These drugs were not considered antibiotics, which specifically target bacterial infections, nor were they considered toxins, which are harmful substances produced by living organisms. They also were not inhibitors, which block the action of a particular enzyme, and they were not vaccinations, which stimulate the body's immune system to create defenses against specific pathogens.

The Use of Salvarsan and Prontosil to Treat Microbial Infections