Aflatoxin is present in/on many different foods. Basically, mold and fungus byproducts are not good for us...
For lots of good information on this subject, visit the USDA:
Unlike third-world countries, where large outbreaks have occurred from the lack of regulatory measures and high exposure levels, the U.S. has no reported human outbreaks of acute aflatoxicosis.
The clinical syndrome of aflatoxicosis is characterized by abdominal pain, vomiting, pulmonary edema, convulsions, coma, liver damage, and death.
Aflatoxin B1 is positively associated with liver cell cancer, supported by epidemiological studies done in Asia and Africa.
Susceptibility to aflatoxicosis may be influenced by age, sex, nutritional status, health, and the level and duration of exposure.
Long-term exposure to low levels of aflatoxins in the food supply may have adverse effects over time to humans.
Humans can become sick by consuming unsafe levels of aflatoxin contaminated food and food products from grains, nuts and milk.[/i]