“…In contrast, mice infected with LCM virus in utero or shortly after birth do not generate such cells (Marker & Volkert, 1973;Cihak & Lehmann-Grube, 1974) and in these mice the virus persists indefinitely (Traub, 1939). All other immune functions, including the production of anti-LCM virus antibodies (for review, see Oldstone, 1979) and the rise of cytotoxic T-cells against the related Pichinde virus (Buchmeier et al, 1980) are present in virus-carrier mice.…”