it will usually be visible on the food . eg, a mouldy peach.
After you eat the contaminated food
it can'tbe located any were as in water that is contaminated or contaminated food which should not be eaten
Once food is contaminated with lead, it cannot be removed and the food should be not used.
It depends on the type of contamination - but most often, NO. Food contaminated by bacterial food usually looks the same as uncontaminated food. Food contaminated by a fungus may look a bit different. Also many times the difference in appearance is so slight as to not be noticeable unless one looks very carefully and knows what to look for. In general the best protection against contaminated food is proper handling and storage.
No. Food can be contaminated with a variety of adulterants - most of which show no signs at all that they are present.
Eating contaminated food and drinking contaminated water
Food poisioning
no, gum on the wall doesn't cause food to be contaminated. food being left out to long at room temperature such as raw uncooked chicken makes food become contaminated.
Food sources of transmission are: contaminated milk, ice cream, vegetables and other foods which often cause epidemics.
If you are referring to how food becomes contaminated then there are three types of contamination and two ways in which it can occur. The 3 types of ways food can be contaminated is by Physical Contaminants: Chemical Contaminants: Contamination of food through a chemical based product such as bleach Biological Contaminants: Contamination from microorganisms such as, yeast, parasites, viruses, bacteria and mold The 2 ways in which food can be contaminated is through Direct Contamination: contamination of food from the original place it was produced, ie. salmonella on chicken, Cross-Contamination: when food is contaminated from one food to another through a non-food object. Ie Apple is contaminated because you did not wash your hands( non food object) after cutting raw chicken.
Food poisoning
People get typhoid mostly by eating contaminated food. Some times by drinking contaminated water.