However, in RAG1 KO mice, while LCMV-NP RNA was not detectable during early stages of infection (day 3 postinfection), it was present at low levels in spleen and liver on day 7 postinfection and was detectable at high levels in all organs at day 35 postinfection, confirming the need for T cells for virus elimination. This evidence concerns the gene RAG1 and infection.