An experimental vaccine developed in Europe to prevent infection by Crimean-Congo hemorrhagic fever virus (CCHFV) has protected cynomolgus macaques in a new collaborative study from National Institutes of Health scientists. The animals received the DNA-based candidate vaccine through intramuscular injection immediately followed by electroporation -- a process in development for human vaccines that helps cells absorb DNA. The study, published in Nature Microbiology, comes about three years after the same research group developed the macaque model for CCHFV. No specific treatments or vaccines for CCHFV exist.