North Carolina State University Nov 17 2025 A new study shows that the effectiveness of current vaccines against porcine reproductive and respiratory syndrome virus (PRRSV) is due to the response of T cells against the disease, rather than the production of antibodies. The work is an important step in identifying specific targets for vaccines on a rapidly mutating virus. PRRSV is a common and costly disease in pigs that is estimated to cause losses of over $1 billion annually to the pork