You posted two different responses to this so I will address them both.

This first one is a study on incarcerated inmate populations who are by definition kept in close, somewhat dirty quarters. A jail shower isn’t something you go into barefoot unless you want some funky fungus. This doesn’t really apply to everyday populations and even referenced that their lack of community data instead of just incarcerated people limits their findings and they can say about them.

Secondly, your other link implies the opposite about “leaky” vaccines than you are implying.

“We now are entering an era when we are starting to develop next-generation vaccines that are ‘leaky’ because they are for diseases that do not do a good job of producing strong natural immunity — diseases like HIV and malaria,” Read said.

What’s the answer?

Rigorous testing and vigilant monitoring of next-generation vaccines to prevent the evolution of more-virulent strains of viruses will help.

Read sees this as crucial to the current attempt to develop an Ebola vaccine. He notes that secondary techniques can help when using leaky vaccines, such as insecticide-treated bed nets for prevention of malaria.

So for one they are talking about diseases like HIV and malaria are more difficult to address because of their lack of immune response, and for two they point out that secondary techniques help. In reference to your first article, the inmates could have been helped by a secondary technique of separation to reduce transmission.