Bacillary dysentery, also known as Shigellosis, is an infectious disease caused by Shigella bacteria. It is estimated to cause 80 to 160 million cases and 600,000 deaths worldwide annually. The vast majority of these cases occur in developing countries.

Symptoms of Shigella infection typically appear within 1 to 3 days after exposure. Initially, it may manifest as mild abdominal pain and diarrhea. The illness can sometimes be mild and resolve on its own within a few days without medical intervention. However, in some cases, blood or mucus may be present in the stool.

Common symptoms of bacillary dysentery include:
* Bloody or mucous stools
* Abdominal pain
* Fever
* Nausea
* Vomiting