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Image of the Week for May 26, 2008

Shigella Infections. This photograph depicts the colonial morphology displayed by Shigella boydii bacteria cultivated on a Hektoen enteric (HE) agar surface; colonies of S. boydii bacteria grown on HE agar display a raised, green, and moist appearance. HE agar is the preferred medium designed for the isolation, and recovery of fecal bacteria belonging to the family Enterbacteriaceae. Four species from the genus Shigella, S boydii, S dysenteriae, S flexneri, and S sonnei, are the etiologic agents responsible for the infection, shigellosis. Most who are infected with Shigella spp. develop diarrhea, which is often bloody, fever, and stomach cramps starting a day or two after they are exposed to the bacterium. Shigellosis usually resolves in 5 to 7 days.
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