CD4 and infection: For example, via nursing, H. bakeri-specific IgG1 antibody is transferred from infected mothers to pre-weaned 10-day old neonates, providing protection against H. bakeri26, and maternally derived Th2 CD4 + T cells are transferred from Nippostrongylus brasiliensis infected mothers to offspring, providing long-lasting cellular immunity against direct infection with this nematode9.