Vaccination 336 Medicine 257 Biomedicine 171 Vaccines 129 Immunology 116 History 113 Prevention 111 Research 105 Smallpox 105 Communicable diseases 89 Vaccination of children 86 Cancer 62 Infection 60 Virology 59 Social aspects 56 Infectious Diseases 53 Law and legislation 53 Immunization of children 52 Government policy 50 Pharmacology 50 Epidemics 49 Public health 49 MEDICAL 48 Microbiology 47 Pharmacology/Toxicology 45 Influenza vaccines 44 Cancer Research 41 Complications 40 Medicine & Public Health 37 COVID-19 (Disease) 36