Related by context. Frequent words. (Click for all words.) 84 swine flu 75 Swine Flu 73 Flu 72 Bird flu 72 H#N# 71 H#N# flu 70 swine flu virus 69 H#N# virus 69 H#N# swine flu 68 swine flu outbreak 66 H#N# influenza 64 flu 62 superbug 60 bird flu 60 whooping cough 60 influenza 60 swine flu pandemic 59 flu virus 59 Influenza 57 avian flu 57 mumps 56 virus 56 norovirus 55 bird flu outbreak 55 West Nile 55 West Nile virus 54 H#N# strain 53 bird flu virus 53 Meningitis 53 SARS 52 outbreak 52 meningitis 52 flu pandemic 52 West Nile Virus 52 pertussis 52 bacterial meningitis 52 measles 52 seasonal flu 52 dengue 51 Bird Flu 51 avian influenza 51 MRSA 51 pandemic flu 51 highly contagious 50 Rabies 50 H#N# bird flu 50 seasonal influenza 50 Cholera 49 pandemic 49 dengue fever 49 Salmonella 49 Tuberculosis 49 Severe Acute Respiratory Syndrome 48 salmonella 48 influenza virus 47 swine flu vaccine 46 Ebola 46 SARS virus 46 Flooding 46 cholera 46 rabies 46 influenza pandemic 46 tuberculosis 46 pandemic influenza 45 Hepatitis 45 Breast cancer 45 respiratory illness 45 chicken pox 45 E. coli 44 chlamydia 44 Virus 44 H#N# vaccine 44 encephalitis 43 E. coli outbreak 43 flu viruses 42 infections 42 infecting 42 cholera outbreak 42 gastroenteritis 42 Infections 42 Infection 42 TB 42 infected 41 epidemic 41 polio 41 Recession 41 Tamiflu 41 Unrest 41 fever 41 germ 41 Anthrax 41 typhoid 41 Polio 41 Lyme disease 41 mad cow 41 Prostate cancer 41 outbreaks 40 stomach bug 40 Floods 40 vaccinated 40 smallpox