Soaps in mousse may be less effective than liquid ones against bacteria and infections. This is confirmed by an American study
Hygienic anti-contagion rules
Enveloping and super-soft, mousse soaps appeal to children and are also taking hold in hospitals, nursing homes, schools, cinemas and other public places.
But according to a study signed by American researchers and published in the "American Journal of Infection Control", they may be less effective than liquid soaps in eliminating bacteria that can cause infections.
Researchers – in 3 different experiments and with 2 different brands of mousse – have discovered that non-antibacterial "foamy" soaps are not as effective as liquid ones in reducing bacterial load on the hands.
The research was signed by Nicolette Dixon, Margie Morgan and Ozlem Equils of the University of California in Los Angeles and the Encior Miora Educational Foundation. Researchers in several experiments made a small group of volunteers (10 people) wash their hands with a soap in mousse and a liquid, which – according to the manufacturers' indications – contained different concentrations of sodium lauryl sulphate: 5-10% in the mousse and 1-5% in liquids. Well, liquid soaps have proved to be more effective than mousses, with a difference in reducing the bacterial load judged to be statistically significant by the researchers.
"In these studies the mousses were not as effective as liquid detergents in eliminating the bacterial load, and this may be due to the fact that a detergent must be massaged to produce foam, while the other is already foamy when it comes out of the dispenser. ”, The authors speculate.
Furthermore, in the case of mousses the content of a soap puff is less than in the liquid version.
"Our data – they conclude – show that washing hands with mousse soaps can give a false feeling of decontamination and, potentially, favor the involuntary spread of resistant germs".
"These studies – the authors warn – will however be repeated on a larger sample and in different places, such as hospitals, schools and airports".
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