If you're traveling overseas for the holidays or in the new year, there are some things you don't want to bring back with you - like mumps, which has cropped up in Scotland; measles, which is circulating in Germany; and mosquito-borne diseases that are spreading in certain Latin American countries, the Caribbean and even Hawaii, where more than 150 people have been diagnosed with dengue fever on the big island. The good news is that, as of the end of 2015, no countries had an "avoid non-essential travel" notice from the Centers for Disease Control and Prevention.