Shigella dysenteriae

Shigella dysenteriae is a category B select agent, a Gram-negative, non-motile, rod-shaped bacterium that belongs to the family Enterobacteriaceae. It has a thermophilic temperature preference, thriving in temperatures between 35°C to 40°C (95°F to 104°F). S. dysenteriae is a Heterotroph, utilizing organic compounds as its energy source. Its energy production occurs through the process of fermentation, where it breaks down glucose and other sugars to produce ATP. The bacterium is stained Gram-negative, indicating the presence of a thin peptidoglycan layer in its cell wall. S. dysenteriae possesses a rod-shaped morphology, with a length of approximately 1-3 μm and a width of 0.5-1 μm. It can be found in the gastrointestinal tracts of humans and primates, colonizing the colonic mucosa and causing severe diarrhea, dysentery, and potential life-threatening complications. S. dysenteriae is an obligate anaerobe, requiring a low-oxygen environment to survive and multiply. It is unable to grow in the presence of oxygen and is susceptible to oxidative stress. However, in the absence of oxygen, it thrives, utilizing anaerobic respiration to generate ATP. Shigella dysenteriae is responsible for causing shigellosis, a highly infectious and debilitating disease that affects millions worldwide. It is transmitted through the fecal-oral route, where contaminated food, water, or surfaces are ingested. Infection with S. dysenteriae can lead to severe symptoms, including abdominal cramps, fever, bloody stools, and dehydration. Notably, S. dysenteriae is endemic in many parts of the world, particularly in areas with poor sanitation, poor hygiene, and inadequate access to healthcare. The bacterium's high infectivity, coupled with its ability to adapt to different environments, makes it a significant public health concern. The development of effective vaccines and antimicrobial treatments is crucial in combating this highly infectious microbe.