File:Salmonella enterica serovar typhimurium.jpg

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Summary

Title / Description	This photograph depicts the colonial growth pattern displayed by Salmonella typhimurium bacteria cultured on a Hektoen enteric (HE) agar medium
Author(s)	CDC
Copyright holder	This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image. See below for license/re-use information.
Source	Public Health Image Library (PHIL)
Date created	1976
Country of first publication	USA
Notes	This photograph depicts the colonial growth pattern displayed by Salmonella typhimurium bacteria cultured on a Hektoen enteric (HE) agar medium; S. typhimurium colonies grown on HE agar are blue-green in color, for this organism is a lactose non-fermenter, but it does produce hydrogen sulfide, (H2S), therefore there can be black-colored deposits present. HE agar is the medium designed for the isolation and recovery of fecal bacteria belonging to the family, Enterbacteriaceae.S. typhimurium causes 25% of the 1.4 million Salmonellosis infections a year in the United States. Most persons infected with Salmonella sp. develop diarrhea, fever, and abdominal cramps 12 - 72 hours after infection. The illness usually lasts 4 - 7 days, and most people recover without treatment. However, in some cases, the diarrhea may be so severe that the patient needs to be hospitalized.
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