Mice were infected intravenously (i.v.) with 0.3–1 × 106 focus forming units of LCMV strain WE. LCMV WE was propagated on L929 cells (European Collection of Authenticated Cell Cultures (ECACC) Catalogue No.: 85011425). LCMV titers in serum and organs were determined by immunological focus forming assay as previously described62 albeit modified by using Vero cells (originally obtained from Daniel D. Pinschewer, University of Basel).
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