A bacterial infection causing diarrhea and gastrointestinal symptoms.
For the 100% active-disease rating, medical records documenting a confirmed active Campylobacter jejuni infection are central. Lab results, treatment records, and clinician notes showing ongoing infection support this level. Once the infection resolves, evidence of any residual conditions becomes the focus. For something like Guillain-Barré syndrome, nerve conduction studies and neurological exam findings would be relevant. For reactive arthritis, joint exam findings and imaging records matter. For uveitis, ophthalmology records and vision test results help establish that rating. Statements from you or people who know you describing how residual symptoms affect your ability to work or carry out daily activities can also support the rating of those residuals under their respective body systems.
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.