Plain Soap as Good as Antibacterial
Researchers Say Regular Soap Kills Germs as Well as Antibacterial Soap
Aug. 17, 2007 -- Antibacterial soaps are no more effective than plain soap and water for killing disease-causing germs, but the jury is still out on whether they promote antibiotic resistance in users, a newly published research analysis shows.
Researchers from the University of Michigan School of Public Health reviewed 27 studies examining the safety and effectiveness of antibacterial products containing the active ingredient triclosan.
That includes most commercially available soaps, detergents and other products with the word 'antibacterial' on their labels, with the notable exception of alcohol-based hand gels.
Soaps containing triclosan at concentrations commonly seen in products sold to the public were found to be no better for killing bacteria and preventing infectious illness than soaps that did not contain triclosan.
"Antibacterial soaps do not provide a benefit above and beyond plain soaps for generally healthy people living in the community," researcher Allison Aiello, PhD, tells WebMD.
"Washing your hands is extremely important for preventing the spread of infectious illness, especially at critical points like after using the toilet, changing the baby, or handling raw foods. But consumers can't assume that antibacterial soaps are better for this than other soaps."
Antibacterial Soap, Antibiotic Resistance
Along with University of Michigan colleagues Elaine Larson, RN, PhD, and Stuart Levy, MD, Aiello has conducted some of the largest and most rigorously designed studies examining the safety and effectiveness of antibacterial products.
Studies in their own laboratory first showed that triclosan can cause some bacteria to become resistant to widely used antibiotics like amoxicillin, but this has not been shown outside the lab.
In another of their studies, 238 families were told to either use triclosan-containing cleaning and hygiene products for a year or similar products without the antibacterial agent. Skin testing conducted before, during, and after the intervention suggested that both cleansing regimens were equally effective for killing germs.
There was also no evidence of an increase in antibiotic-resistant bacteria on the hands of people who washed with the antibacterial products.
A spokesman for the soap industry tells WebMD that no evidence exists outside the laboratory linking the use of antibacterial soaps and cleansers to the promotion of antibiotic-resistant superbugs.
"It is egregious to continually hype the hypothesis that these products are contributing to antibiotic resistance," Brian Sansoni of the Soap and Detergent Association (SDA) tells WebMD. "These researchers keep raising the specter of what could happen, but it is a ghost story without a ghost."