Human macrophages, microglia, and dendritic cells are engrafted in the meninges and perivascular spaces in the hNOG brain. p24+ cells can be detected in the brain following intraperitoneal infection. Human immune cells infiltrate regions of viral replication in the brain, and CD8 T cell depletion leads to meningitis and encephalitis. The gene discussed is CD8A; the disease is infectious meningitis.