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Carry pathogens
Finding foreign objects in food served anywhere is a health and safety hazard.
It is a hazard to eat in a biology lab because your food may have been contaminated by other items in the lab and you could then eat the contaminant.
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It is true that the primary food safety hazard is contamination of the food. Food going bad is also a hazard, although that could also be construed as a form of contamination by bacteria. You could, in theory, be injured by having a large quantity of food fall on top of you, which would only be a hazard in a food warehouse, if the food was not properly stored. If flour dust gets into the air, it is highly flammable and can explode, which is another kind of food safety hazard. If you fell into a huge vat of molasses, you could drown. So a variety of hazards are at least theoretically possible.
Choking, Allergies, and getting food stuck in places. (I think)
No, if they are serving food there is no problem unless they put their hands in the food. A person with a cold would be more dangerous than someone with polish.
saliva an get on the food handlers hands
It's outlawed in Canada and the rest of the USA as well. It's because it is a food safety hazard and a hazard to other ruminants in the country. People and animals do die from BSE, and it's a disease that is pretty much untreatable.
Hazard Analysis Critical Control Point (HACCP) is a systematic approach to food safety that identifies, evaluates, and controls biological, chemical, and physical hazards throughout the food production process. It focuses on identifying critical control points where hazards can be prevented, eliminated, or reduced to ensure the safety of the final food product. HACCP is a preventative system to manage food safety risks.
At each step of food preparation there is a risk of a hazard to food safety. It is possible to take action that eliminates that hazard or reduces it to a minimum. These steps are called Critical Control Points and are part of the HACCP system.
Practicing personal hygiene is important for food safety at restaurants. The hazard of passing on germs and bacteria when handling food is high unless proper hygiene is followed, including washing hands properly and wearing gloves.