Mutagen-directed Attenuation of Rift Valley Fever Virus as a Method for Vaccine Development Caplen, Howard and Peters, C. J. and Bishop, David H. L.,, 66, 2271-2277 (1985), doi = https://doi.org/10.1099/0022-1317-66-10-2271, publicationName = Microbiology Society, issn = 0022-1317, abstract= SUMMARY Serial mutagenesis with 5-fluorouracil has been employed to derive an attenuated strain of Rift Valley fever virus for use as a live virus vaccine., language=, type=