Summary
A cold-adapted, nonvirulent variant of the Armstrong strain of lymphocytic choriomeningitis virus was isolated from infected L929 cells maintained at 25° C. This variant, designated P17, was capable of replicating in the central nervous system of mice without causing disease and conferring immunity to back challenge with the parental strain.
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Brayton, P.R., Maassab, H.F. Characterization of a nonvirulent variant of lymphocytic choriomeningitis virus. Archives of Virology 74, 85–89 (1982). https://doi.org/10.1007/BF01320786
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DOI: https://doi.org/10.1007/BF01320786