TOPICS: Immunologic memory, memory B cells, memory helper T cells (Th), memory cytotoxic T cells (Tc), live (attenuated) vaccine, killed (inactivated) vaccine, subunit vaccine, virulence factor, booster, humoral response, cellular response, recombinant DNA, toxoid, protein conjugate, adjuvant, dendritic cell presentation, adenovirus vaccine, salmonella typhi vaccine, polio (sabin) vaccine, varicella vaccine, smallpox vaccine, BCG vaccine, influenza intranasal vaccine, yellow fever vaccine, MMR (measles, mumps, and rubella) vaccine, rotavirus vaccine, rabies vaccine, polio (salk) vaccine, influenza intramuscular vaccine, DTaP (diphtheria toxoid, tetanus toxoid, and acellular pertussis antigen) vaccine, HPV vaccine, HBV vaccine, streptococcus pneumoniae vaccine, haemophilus influenzae type b vaccine, neisseria meningitidis vaccine, innate immune system, adaptive immune system, interleukins, antibodies, major histocompatibility complex (MHC) class I, nucleated cells, dendritic cells, cross-presentation, cytotoxic T cell (Tc) activation, naive T helper cell (Th), B cell receptor (BCR), B cell proliferation, B cell differentiation, plasma cell, antibody secretion, macrophage interaction with T cell, cytokine release, TNF, IL-1, IL-6, IL-8, IL-12, phagocytosis, oxygen independent killing, antigen presentation, phagosome, lysosome, phagolysosome, CCR5, C3b, T cell activation, CD28, B7 (CD80/86), LPS, CD40, CD40L, CD14, Fc receptor