The illness can be mild or sever enough to consult a doctor. It may take only a few days until complete recovery, or hospitalization may be necessary. In rare cases, food-borne illness can be fatal. Bacteria are minute organisms which cannot be seen by the naked eye. In food which has not been properly stored or handled, they can multiply enough to cause illness.
Some types of bacteria produce a toxin or poison, which can cause illness.
One example is the deadly botulism caused by toxins in homemade flavored oils or in home-canned, low acid foods like tomatoes. This is especially important when handling raw meat, poultry, seafood and eggs. Unwashed hands can spread bacteria all over your kitchen. Be sure to keep counters, cutting boards, utensils and sinks clean as well. Don't cross contaminate.