Vaccines and the immunization strategies built around them, the largest single cluster in this subcategory, covering both the individual disease-target vaccines (adenovirus, anthrax, BCG, caries, chikungunya, cholera, conjugate vaccine platforms, COVID-19, cytomegalovirus, dengue, diphtheria, Ebola, Epstein-Barr virus, group B streptococcus, hantavirus, hepatitis A, hepatitis B, hepatitis E, hexavalent combination, Hib, HIV, hookworm, HPV, influenza, Japanese encephalitis, leishmaniasis, malaria, Marburg, measles, meningococcal, MMR combination, mumps, pertussis, plague, pneumococcal, polio, rabies, respiratory syncytial virus, rotavirus, rubella, schistosomiasis, smallpox, tetanus, tick-borne encephalitis, trypanosomiasis, typhoid, typhus, UTI, varicella, whole-cell platform, yellow fever, Zika, zoster) and the vaccine platform types, delivery concepts and historical precursor named on their own (attenuated vaccine, DNA vaccine, DPT vaccine, mRNA vaccine, subunit vaccine, active immunization, cocooning immunization, ring vaccination, vaccination itself, vaccine therapy, and variolation, the pre-vaccine historical practice from which modern vaccination descended). A product that supplies ready-made antibodies rather than training the immune system to make its own is grouped instead under immunoglobulin and passive immunity products.