Related by context. Frequent words. (Click for all words.) 76 swine flu 74 swine flu virus 71 H#N# swine flu 68 H#N# flu 68 Swine flu 67 H#N# virus 66 outbreak 63 pandemic 63 Swine Flu 62 flu pandemic 62 influenza pandemic 62 H#N# 62 flu virus 61 flu 60 SARS outbreak 58 pandemic flu 58 SARS 57 influenza 56 avian flu 56 Flu 55 bird flu 53 norovirus 53 virus 52 MRSA 52 avian influenza 51 bird flu virus 51 cholera outbreak 50 influenza virus 49 salmonella outbreak 49 highly contagious 49 Influenza 49 whooping cough 49 West Nile virus 49 H#N# strain 49 seasonal flu 49 swine flu vaccine 48 outbreaks 48 Bird flu 48 mumps 47 anti viral 47 pertussis 47 dengue 46 economic downturn 46 salmonella 46 mad cow 46 infectious disease 46 E. coli 45 severe acute respiratory 45 H#N# vaccine 45 H#N# bird flu 44 Tamiflu 44 credit crunch 44 West Nile Virus 44 epidemic 44 mad cow disease 44 West Nile 44 recession 44 AIDS epidemic 43 bioterrorism 43 tuberculosis 43 infection 42 Salmonella 42 smallpox 42 cholera 42 measles 42 bacterial infection 42 flu vaccine 42 Ebola 42 antiviral 41 downturn 41 dengue fever 41 flu vaccines 41 communicable diseases 41 contagion 41 infections 41 crisis 41 meningitis 41 subprime mortgage crisis 41 Sars 41 germ 41 pandemics 40 staph infection 40 slowdown 39 vaccine 39 illness 39 bedbugs 39 germs 39 quarantine 39 cholera epidemic 39 epidemics 39 influenza vaccine 38 infestation 38 Hurricane Dean 38 Tuberculosis 38 anthrax 38 rabies 38 bed bugs 38 antibiotic 38 vaccinations 38 Great Recession 38 bacterial infections