Related by context. Frequent words. (Click for all words.) 73 smallpox 58 diphtheria 51 yellow fever 50 measles 50 leprosy 49 polio 49 bubonic plague 48 typhoid fever 47 flu epidemic 47 tuberculosis 46 communicable disease 46 pandemic flu 46 pandemics 46 anthrax 46 typhoid 46 pandemic 46 dysentery 45 epidemics 45 contagious diseases 45 Polio 45 malaria 45 chicken pox 45 smallpox vaccine 45 tetanus 44 Avian Flu 44 chickenpox 44 contagious disease 44 polio vaccine 44 flu pandemic 44 pestilence 43 germ 43 penicillin 43 inoculations 43 infectious disease 43 pandemic influenza 43 bioterrorism 43 H#N# 43 avian flu 43 H#N# swine flu 43 Ebola 43 influenza 43 Swine Flu 43 influenza pandemic 42 flu 42 biological warfare 42 cholera 42 Tuberculosis 42 H#N# flu 42 Syphilis 42 virus 41 influenza virus 41 syphilis 41 infectious diseases 41 vaccine 41 flu virus 41 H#N# influenza virus 41 vaccinations 41 immunizations 41 scabies 40 vaccination 40 rubella 40 vaccines 40 communicable diseases 40 polio virus 40 H#N# pandemic 40 West Nile Virus 40 whooping cough 40 superbug 40 pertussis 40 mosquito borne disease 40 immunization 39 Ebola virus 39 rabies 39 herpes 39 H#N# influenza 39 scurvy 39 inoculation 39 Measles 39 flu vaccine 39 disease 39 sexually transmitted disease 39 germs 39 viral diseases 39 sicknesses 39 H#N# virus 39 meningitis 38 West Nile virus 38 monkeypox 38 bioterror 38 antiviral drugs 38 Avian flu 38 mumps 38 infection 38 TB 38 swine flu pandemic 38 viruses 38 anti viral 38 staph 38 encephalitis 38 swine flu 38 tropical diseases