A neurotropic virus is a type of virus that has a particular affinity for the nervous system. These viruses can infect nerve cells, leading to various neurological diseases. Examples of neurotropic viruses include the rabies virus and the West Nile virus, which can cause severe symptoms and complications in infected individuals. These viruses can enter the nervous system through different routes, such as direct infection or via the bloodstream. Once inside, they can replicate and spread, potentially leading to inflammation and damage to brain tissue. Understanding neurotropic viruses is crucial for developing effective treatments and vaccines.