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The man of the hour (Picture from Microsoft Clip Art)


The man of the hour

Dr. Daniel Salmon, an American bacteriologist, first discovered a bacillus which caused ‘swing plague.’  The strain of bacteria was located in the intestinal tract of a pig.  At the time, 1880's, this bacteria was named Bacterium suipestifer.  It was later renamed Salmonella after Dr. Salmon.



Dr. Daniel Salmon (Image located at http:/


7 days and 7 nights

Salmonella enteritidis most likely originated from an antibiotic used in the poultry industry known as prophylaxis.  This antibiotic led to the removal of two Salmonella strains, S. gallinarum and S. pullorum.  These strains cause diarrhea in chicks but had no apparent effect on humans.  With the eradication of these two other strands, a vacant niche was created which allowed for Salmonella enteritidis to flourish and fill the missing niche.  Thus, humans are in a sense responsible for the invasion of S. enteritidis and symptoms found in humans.

Keep lookingHiding (Image from Microsoft Clip Art)

Bacterial strains of Salmonella enteritidis may be found in and transmitted through poultry, reptiles, and various other animals.  Salmonella is primarily found in animal intestines.  As a result, most human cases are reported after eating animal products such as dairy, poultry, eggs, and meat. 



It is also interesting to note that Salmonella has been discovered to exist as free-living organisms that can reproduce under natural conditions.  Salmonella can also be found existing outside of an animal host such as water, soil, or sewage.

The following table shows the amount of days that Salmonella can stay alive when located in different habitats.

Days Remaining Viable:



Tap water


Pond water


Pasture soil


Garden soil


Thus, water, especially if polluted, also helps to spread the bacteria. 

Polluted Water - a possible Salmonella habitat (Image by David A. Villa)

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