Be sure that foods held under refrigeration are cold. Pay special attention to street vendors. Check to see that they have soap and water facilities to keep their station clean and sanitary. Inspect to make sure they have equipment capable of safely holding foods hot or cold. If not, then do not eat from them.
Pasteurization is a heat process used to destroy all disease-causing microbes.
In the U.S., regulations for pasteurization of dairy foods have been mandated for several decades. Other foreign countries may or may not have regulations requiring pasteurization. Check the label and ask questions. If a dairy food or fruit juice is not pasteurized, it is not assured safe. Since these foods may be handled extensively by human hands, they have a high chance of being contaminated.