"... travelers should wash their hands 'meticulously' and be cautious about food and water consumption..."

There's a Superbug making a return visit to the US called shigella sonnei.

The bug gives you diarrhea, and this new strain is resistant to antibiotics.  

So You say the US is far away, no problem.  The bug is being transmitted by international travelers.

Tourism being a large part of Thailand's income, it's important to keep this in mind, especially since many tourists these days are not very sanitary minded. 

Travelers Are Bringing a Superbug into the United States | TIME