Lyme disease, caused by the bacteria Borrelia burgdorferi and transmitted by Ixodes ticks, is expanding in many countries, posing a significant global health concern. The outer surface protein A (OspA) of B. burgdorferi is currently the most promising target for vaccine development, primarily because of its broad conservation among different bacterial strains that cause the disease. In a recent publication, researchers from the University of Pennsylvania and collaborators proposed using a lipid nanoparticle-encapsulated nucleoside-modified mRNA (mRNA-LNP) platform, similar to that of clinical vaccines against SARS-CoV-2, to develop a vaccine against Lyme disease.