Bacterial agent of acute diarrhea causing disease outbreaks

Which bacterial agent of acute diarrhea has humans as its most important reservoir and is more likely to spread and cause disease outbreaks from person-to-person contact? 

Shigella species (s onnei, dysenteriae, flexneri, and boydii ) are highly adapted to human hosts and humans are the most significant reservoir that may contribute to outbreaks within close contacts in family, daycare settings, and through contamination of food. S. dysenteriae causes severe disease resulting from high Shiga toxin production and is associated with epidemic outbreaks in the developing world.


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