 "Can a bar of soap transmit infection?")
The most rigorous study of this question was published in 1965. Scientists conducted a series of experiments in which they intentionally contaminated their hands with about five billion bacteria. The bacteria were disease-causing strains, such as Staph and E. coli.
The scientists then washed their hands with a bar of soap and had a second person wash with the same bar of soap. They found that bacteria were not transferred to the second user and concluded: “The level of bacteria that may occur on bar soap, even under extreme usage conditions (heavy usage, poorly designed non-drainable soap dishes, etc.)
The scientists then washed their hands with a bar of soap and had a second person wash with the same bar of soap. They found that bacteria were not transferred to the second user and concluded: “The level of bacteria that may occur on bar soap, even under extreme usage conditions (heavy usage, poorly designed non-drainable soap dishes, etc.)
