A premature infant administered a dietary supplement, ABC Dophilus® Powder (Solgar®), as part of in-hospital course of treatment, developed gastrointestinal mucormycosis caused by the mold Rhizopus oryzae & died.
Rhizopus oryzae mold was found to be present as a contaminant in an unopened container of the ABC Dophilus Powder, which is formulated to contain 3 species of live bacteria.
Gastrointestinal mucormycosis primarily occurs in immuno-compromised persons, such as prematurely born infants
Zonulin - http://www.jillcarnahan.com/2013/07/14/zonulin-leaky-gut/#
Top Causes of Increased Zonulin and Development of Leaky Gut:
1.  Overgrowth of harmful organisms, like bacteria or yeast in the intestine
     a. SIBO = small intestinal bacterial overgrowth
     b. Fungal dysbiosis or candida overgrowth
     c. Parasite infections
2.  Gliadin in the diet (gluten containing foods). 
Gliadin is a protein in wheat, that like gluten, is a trigger for people with celiac disease.
However, a study published in the Scandiavian Journal of Gastroenterology in 2006 clearly showed that gliadin can affect zonulin even in people without the gene for celiac...The researchers concluded that: Based on our results, we concluded that gliadin activates zonulin signaling irrespective of the genetic expression of autoimmunity, leading to increased intestinal permeability to macromolecules...The significance of this is that gluten affects intestinal permeability in all persons to different extents. It also means that 100% of patients with autoimmune disease or leaky gut could potentially benefit from a gluten-free diet