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W0lf93
The biggest cause of foodborne illnesses is when the individual consumes food or beverages that are contaminated in which is one way of providing or causing an individual to have foodborne illnesses such as infections that it contains once the food is contaminated.
Erudite1
The question above is incomplete, the options attached to the question are:
A. Poor Hygiene.
B. Toothpick
C. Employee snacking
D. Virus.

ANSWER
The correct option is D.
Biological contaminants in form of different types of bacteria, viruses and other parasites are the biggest cause of food borne illnesses. Food borne illnesses occur by consuming foods that have been contaminated by these microorganisms. Common symptoms of food borne illnesses are: vomiting, diarrhea, abdominal cramps, nausea, fever, etc. Incubation period of these biological contaminants can range from few hours to one week. 

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