Related by context. Frequent words. (Click for all words.) 69 epidemics 69 pandemic 67 influenza pandemic 66 flu pandemic 61 pandemic flu 60 pandemic influenza 56 outbreaks 56 H#N# pandemic 56 natural disasters 53 avian flu 53 disasters 52 smallpox 52 natural catastrophes 52 bird flu pandemic 51 viruses 51 flu epidemic 51 influenza viruses 51 flu strains 51 infectious diseases 50 swine flu pandemic 50 flu viruses 50 epidemic 50 influenza virus 49 catastrophes 49 bioterrorism 49 crises 49 influenza 48 pandemic strain 47 tsunamis 47 contagious diseases 47 flu virus 47 pathogens 46 infectious disease 46 Avian flu 46 seasonal influenza 46 calamities 46 famines 46 antiviral drugs 46 avian influenza 46 outbreak 45 H#N# swine flu 45 Ebola 45 diseases 44 communicable diseases 44 viral infections 44 seasonal flu 44 recessions 44 vaccines 44 climate change 43 bird flu 43 swine flu virus 43 Severe Acute Respiratory Syndrome 43 food borne illnesses 43 bird flu outbreaks 43 bubonic plague 43 genocides 43 H#N# 43 superbugs 42 hurricanes 42 downturns 42 virus 42 natural calamities 42 H#N# avian influenza 42 Viruses 42 flu 42 SARS 42 emergencies 42 scourges 42 disease 41 antibiotic resistance 41 Influenza 41 AIDS epidemic 41 rotavirus 41 Gerberding 41 malaria 41 antivirals 41 economic downturns 41 SARS epidemic 41 infections 41 swine flu outbreak 41 extinctions 40 organisms 40 H#N# virus 40 mass extinction 40 H#N# strain 40 earthquakes 40 oseltamivir 40 mosquito borne disease 40 Pandemic 40 H#N# influenza 39 germs 39 Outbreaks 39 infect humans 39 SARS outbreak 39 bird flu virus 39 chronic diseases 39 pathogen 39 external shocks 39 droughts 39 H#N# flu 39 viral diseases