The document discusses the various routes by which toxins can enter the body, including inhalation, skin absorption, ingestion, and injection. It then lists several modes of administration of toxins, such as contaminated food, water, soil, and animal feces. Finally, it notes several sources of food contamination, such as retail shops, restaurants, and foods during travel, where pathogens from raw meat and poultry can spread due to improper handling and storage.