In a new warning this week, the government discusses Cronobacter contamination, which the Centers for Disease Control and Prevention says is a particular problem in powdered infant formulas, and to a lesser degree herbal teas, starches and powdered milk.
Because powdered infant formula is not sterile, it can sometimes contain Cronobacter — formerly known as Enterobacter sakazakii — a germ found naturally in the environment that can survive in very dry conditions, the CDC reports.
Cronobacter has been found in various dry foods, such as formula, powdered milk, herbal teas and starches. It has also been found in sewer water and may be found in other places, too, according to the CDC.
FoodWorld 
I do not know the reason for this reminder, as it refers to standard hygienic practices and well-known sources of the organism. Links to our own work and the WHO risk assessments can be found here: http://www.foodmicrobe.com/publications.htm