Why would the availability of antibiotics as ‘OTC products’ in some parts of the world (outside the U.S.) affect Microbial Resistance in the United States?
The simple answer is it's a small world. Between modern transportation and global travel, bugs affecting people in other countries can affect tourists from the U.S. and be brought back to our country.
If antibiotics are used as OTC products in other countries, that would pretty much guarantee a higher rate of inappropriate usage of antibiotics, which would cause a higher rate of microbial resistance to microorganisms. Thus, if a U.S. tourist brings one of these "super bugs" back to the states, it could add to the microbial resistance here.