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Foodborne diseases (FBDs) are a significant global public health concern, causing millions of cases of illness, hospitalizations, and even deaths each year. These diseases are caused by the ingestion of food or beverages contaminated by harmful microorganisms or toxic substances. The contaminants may include bacteria, viruses, parasites, and toxins, as well as chemicals such as pesticides and heavy metals. Foodborne diseases can be classified in various ways, including by the causative agent, transmission route, or the symptoms they produce. This essay aims to discuss the various foodborne diseases, their classification, pathogenesis, prevention, and control measures in the context of environmental health and ecotoxicology.

### Classification of Foodborne Diseases

Foodborne diseases can be broadly classified into two categories: infectious and non-infectious diseases.

1. Infectious Foodborne Diseases: These diseases are caused by microorganisms such as bacteria, viruses, and parasites that infect the food or beverage. The pathogens multiply in the human body after ingestion and cause illness through their direct effects or the toxins they produce.
   - Bacterial infections: Common bacteria that cause foodborne illnesses include *Salmonella*, *Escherichia coli* (E. coli), *Campylobacter*, and *Listeria*.
   - Viral infections: Viruses such as *Norovirus*, *Hepatitis A*, and *Rotavirus* are often transmitted through contaminated food or water.
   - Parasitic infections: Parasites such as *Giardia*, *Cryptosporidium*, *Toxoplasma*, and *Trichinella* can cause foodborne diseases.

2. Non-Infectious Foodborne Diseases: These are caused by toxins, chemicals, or heavy metals that contaminate food and cause harm to the body.
   - Foodborne intoxications: This includes diseases caused by toxins produced by bacteria, such as *Clostridium botulinum* (botulism) and *Staphylococcus aureus*. These diseases occur when the toxin is ingested along with the contaminated food.
   - Chemical contamination: This includes contamination by agricultural chemicals like pesticides, as well as by industrial pollutants such as heavy metals (lead, mercury, cadmium) and environmental pollutants.
   
### Pathogenesis of Foodborne Diseases

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