Bacterial infections causing diarrhea and gastrointestinal symptoms.
For the 100% active-disease rating, medical records showing a confirmed, ongoing Shigella infection are the core evidence. Lab reports, hospitalization records, treatment notes, and a physician's statement confirming the disease is currently active all directly support this level. Once active disease resolves, the focus shifts to any residual conditions. For something like reactive arthritis, rheumatology records, imaging, and range-of-motion findings matter. For hemolytic-uremic syndrome, kidney function tests, blood counts, and nephrology notes are relevant. Statements from you or people who know you — describing how lingering symptoms affect your work, daily activities, or mobility — can help show the severity of those residuals. Each residual is evaluated under its own body system's criteria.
Conditions that are often caused or made worse by this one. If you have any of these, they may be claimable as secondary service connection.