The article indicates that this could be used to create a vaccine. How would that work? So far as I understand the medicine for vaccines, they are used to train

The article indicates that this could be used to create a vaccine. How would that work? So far as I understand the medicine for vaccines, they are used to train your immune system to create new antibodies by exposing it to the virus. What process would be used to train the immune system from an existing antibody?