Food poisoning is caused by germ microbes that find their way into the guts of the body. When in the body, these pathogens irritates the stomach and intestines thereby causing symptoms that range from stomach upset to vomiting and diarrhea.
germs Food poisoning is also caused by how we preserve our food and how fresh is it. There are few germs that cause food poisoning: Noro-virus is a pathogen responsible for causing outbreaks such as vomiting and diarrhea.
Botulism is a severe type of food poisoning that produces neurotoxin, which cause respiratory failure and eventually death. Most outbreaks of botulism are reported to be traced to home-canned foods. Campylobacter produces pathogen, which come from unpasteurized dairy products such as uncooked meat or poutry products. Listeria is a food borne pathogen that causes miscarriage in pregnant women.

Clostridium perfringens in high amount in the intestine can cause cramps and diarrhea. Shigella are highly contagious group of bacteria through spread through stool, food contaminated by an infected person, or on eatable produce grown in contaminated fields or sewages.

Bacillus cereus produces bugs causes food poisoning, with symptoms such as diarrhea and vomiting.
http://healthful.com.ng/germs-that-cause-food-poisoning/

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Microbial Food Poisoning

Food poisoning is being discovered as any illness resulting from the consumption of contaminated food, pathogenic bacteria, viruses, parasite or poisonous mushrooms (toxins) that contaminate food. It arises from improper handling, preparation or food storage...

http://www.scharticles.com/microbial-food-poisoning-2/