Related by context. Frequent words. (Click for all words.) 55 polio 54 AIDS epidemic 54 epidemic 53 outbreak 52 measles 52 epidemics 50 H#N# swine flu 50 pandemic 49 whooping cough 48 Tuberculosis 48 swine flu pandemic 48 smallpox 48 tuberculosis 48 H#N# virus 48 H#N# 47 swine flu 47 Swine Flu 47 H#N# flu 47 influenza 46 H#N# influenza 46 flu pandemic 46 swine flu outbreak 46 Swine flu 46 influenza pandemic 45 meningitis 45 outbreaks 44 disease 44 chickenpox 44 pertussis 44 swine flu virus 43 crisis 43 Polio 43 cholera outbreak 43 Flu 43 West Nile virus 42 mumps 42 bird flu outbreak 42 cholera epidemic 42 West Nile 42 blizzard 42 bacterial meningitis 42 cholera 42 avian flu 42 Depression 41 virus 41 chicken pox 41 flu 41 Ebola 41 bird flu 41 highly contagious 41 superbug 41 avian influenza 41 syphilis 41 pandemics 41 yellow fever 40 AIDS 40 flu bug 40 H#N# strain 40 encephalitis 40 immunization 40 pandemic flu 40 dengue fever 40 pandemic influenza 40 malaria 40 TB 40 devastating floods 40 staph infection 40 Influenza 39 Meningitis 39 dengue 39 SARS outbreak 39 WNV 39 West Nile Virus 39 infections 39 holocaust 39 HIV AIDS 39 Severe Acute Respiratory Syndrome 39 recession 39 Bird flu 39 SARS 39 MRSA 39 heatwave 39 tornado 39 Great Depression 39 seasonal influenza 38 HIV infections 38 infectious disease 38 Rabies 38 leprosy 38 flu virus 38 illness 38 blizzards 38 floods 37 Plague 37 infection 37 rabies 37 vaccination 37 credit crunch 37 infectious diseases 37 Cholera 37 economic downturn