Johne disease is a long-lasting illness in farm animals like sheep and goats. It is caused by a specific bacteria that attacks the digestive tract. Because it stays in the body for a long time, it is very hard for the animal's immune system to clear out completely.
Research shows that the body tries to fight the infection early on using cell-mediated immunity. This means the body sends specialized cells to the area of infection to try and stop the bacteria from spreading. However, these defenses are often not enough to stop the disease entirely in many cases.
Creating a vaccine is currently very difficult. While some vaccines have shown small amounts of protection in specific areas, they do not provide full immunity. Scientists are still trying to figure out exactly what triggers a strong enough response to keep animals healthy over time.
To make better vaccines, experts need to understand how the lining of the gut reacts to the bacteria. By filling these knowledge gaps, researchers hope to develop more effective ways to protect livestock and improve overall animal health.
