Johne's disease, caused by Mycobacterium paratuberculosis, is a slow-progressing but economically damaging condition that causes chronic diarrhea and weight loss in cattle, often spreading silently through a herd for years before clinical signs appear. This indirect ELISA kit detects antibodies to the pathogen in bovine serum, supporting herd-level surveillance programs aimed at identifying and managing infected animals before the disease becomes widespread. Shelf life 12 months, store at 2-8°C.