Philip M. Tierno, a professor of microbiology and pathology, highlighted that the bottoms of shoes can harbor gross substances, stating, 'If the bottom of the shoe has ridges or there's ribbing on the side or other areas that can collect material, then think about what they're picking up.' He emphasized the risk of encountering pathogens from urban environments and advised travelers on the importance of prevention methods.
Dr. Charles Gerba, a microbiologist, noted a shocking statistic: 'If you wear shoes for more than a month, 93% will have fecal bacteria on the bottom of them.' This underscores the potential health risks associated with not properly protecting and storing footwear while traveling.
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