Aflatoxin is a fungal toxin that commonly contaminates maize and other types of crops during production, harvest, storage or processing.Exposure to aflatoxin is known to cause both chronic and acute hepatocellular injury.In Kenya, acute aflatoxin poisoning results in liver failure and death in up to 40% of cases.flatoxin is a fungal toxin that commonly contaminates maize and other types of crops during production, harvest, storage or processing.