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This bacterium causes shigellosis, with shigella sonnei. It causes diarrhea and dysentery in humans. It can also cause symptoms of fever and stomach cramps. 


Humans; It is most prevalent in children and immunocompromised individuals. 

Transmission / Exposure Route


Case Fatality Ratio

Shigellosis causes 1.1 million deaths and over 164 million cases each year, occurring mainly in developing nations. 

Incubation Period

In a healthy human, the incubation period is about 5 to 7 days.


A Gram negative, non-motile, non-spore forming, rod shaped. 

Enviromental Survival

It grows in a facultative anaerobic environment, so it does not require a specific amount of oxygen to survive. It is resistant, as it is not susceptible to dapsone, but it is susceptible to ampicillin.

Dose Response Models

Route: oral (in milk), Response: positive stool isolation


$$P(response)=1-[1+dose\frac{2^{\frac{1}{a}}-1}{N^{50}} ]^{-a}$$

Optimized parameters:
a = 2.65E-01
N50 = 1.48E+03
ID50 = 1.48E+03

Data from Other Sources

Read more:


by {{author}} On Global Water Pathogen Project


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Other names:

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NCBI Publications on Risk Assesment:

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