In recent years not much study has gone into the area of bar soaps, and liquid soaps but some interesting finding have emerged from recent testing in Australia. Our perception always was that bar soap would be more likely to spread germs in a public restroom than liquid soaps, but these results do not agree.
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The last in-depth report most scientist worked off was conducted in 1965, during those test scientists covered their hands with various bacteria numbering around five million at the time. Each scientist washed their hands with the bar of soap and subsequently past it onto the next to do the same with the same bar of soap. The case study at the time concluded that there was no transfer of bacteria from the first person to the second, therefore at the time, the conclusion was that the level of bacteria did not constitute a health problem.
1988 was the next time studies were conducted in a similar format, but the earlier findings were upheld. This particular time they were testing for E.coli amongst other bacteria which was very much in the public imagination at the time with various cases reported around the world. The experiments showed that in 16 subjects had washed with the same bars and no detectable levels were found after they shared and swapped the soap. Concluding that very minimal hazards exist after routine washing.
More recent studies between the two have proved that although environmental bacteria have been found on both, neither have shown levels that can be considered a source of risk of infection to humans, in reality, all soaps are made from the same components. They both contain detergent, alkali and fatty acids.