Which of the following is not classified as a foodborne illness?

HIV, or Human Immunodeficiency Virus, is primarily a virus that attacks the immune system and is transmitted through blood, semen, vaginal fluids, and breast milk, rather than through food. It does not fall under the category of foodborne illnesses, which are typically caused by pathogens such as bacteria, viruses, or parasites that can be transmitted through contaminated food or water.

On the other hand, Shigella, Norwalk (now more commonly known as norovirus), and E. Coli are all classified as foodborne illnesses. They are infectious agents that can lead to gastrointestinal illness when ingested through contaminated food or water. Shigella is a bacterium that causes diarrhea, while Norwalk virus is a common cause of viral gastroenteritis. E. Coli includes various strains, some of which can lead to serious foodborne outbreaks.