Related by context. Frequent words. (Click for all words.) 74 pandemics 70 influenza pandemic 66 flu pandemic 64 pandemic influenza 64 pandemic 58 epidemics 57 H#N# viruses 57 outbreaks 57 pandemic flu 57 flu epidemic 57 H#N# pandemic 56 H#N# avian flu 56 influenza 55 avian flu 55 pandemic strain 54 H#N# influenza virus 54 H#N# avian influenza 54 influenza viruses 54 pandemic H#N# 53 influenza virus 52 avian influenza 52 seasonal influenza 52 flu strains 51 H#N# 51 bird flu outbreaks 51 H#N# strain 51 flu virus 50 flu viruses 50 bird flu pandemic 50 H#N# virus 50 avian influenza virus 50 smallpox 49 H#N# swine flu 49 bird flu 49 outbreak 49 swine flu pandemic 48 heatwaves 48 epidemic 48 Avian Flu 48 extinctions 48 bird flu outbreak 48 H#N# influenza 48 rotavirus 48 mosquito borne disease 48 Ebola 48 bubonic plague 47 pandemic preparedness 47 swine flu virus 47 avian flu virus 47 seasonal flu 47 natural catastrophes 46 flu 46 H#N# flu 46 disasters 46 Avian flu 46 C. difficile 46 infections 46 Influenza 46 famines 45 H#N# bird flu 45 tsunamis 45 pertussis 45 Japanese encephalitis 45 Flu 45 foodborne illnesses 45 whooping cough 45 antiviral drugs 45 vCJD 44 viruses 44 infectious disease 44 antibiotic resistance 44 influenza vaccines 44 infectious diseases 44 Avian Influenza 44 bird flu virus 44 dengue 44 drug resistant strains 44 Smallpox 44 monkeypox 44 A/H#N# 44 food borne illnesses 44 mass extinction 44 natural disasters 44 borne illness 43 swine flu 43 swine influenza 43 superbug 43 AIDS epidemic 43 XDR TB 43 virulent strain 43 cholera outbreak 43 droughts 43 pathogens 43 virus 43 vaccines 43 A/H#N# flu 43 disease 43 malaria 43 foodborne illness 43 measles 43 swine flu outbreak