Related by context. Frequent words. (Click for all words.) 72 seasonal flu 65 Flu shots 65 seasonal influenza 63 Flu 62 flu 60 flu vaccinations 57 H#N# flu 57 Swine flu 57 flu vaccination 56 influenza 56 Pneumonia 55 H#N# vaccine 55 flu vaccines 55 H#N# 54 H#N# swine flu 54 whooping cough 54 swine flu vaccine 54 flu vaccine 53 pertussis 52 pandemic flu 52 Lung cancer 51 H#N# influenza 51 flu virus 51 influenza pandemic 51 H#N# vaccination 51 H#N# vaccines 51 Influenza 50 flu pandemic 50 mumps 50 influenza vaccine 50 bacterial meningitis 49 chickenpox 49 flu viruses 49 H#N# virus 49 Vaccination 49 Measles 49 swine flu 49 Prostate cancer 49 vaccinated 49 Rabies 49 H#N# pandemic 49 vaccine 48 influenza virus 48 FluMist 48 H#N# strain 48 pandemic influenza 48 swine flu virus 48 pandemic 48 flu strains 48 measles 48 vaccinations 47 Bird flu 47 West Nile Virus 47 chlamydia 47 West Nile virus 47 Tuberculosis 47 Immunization 47 Breast cancer 46 rotavirus 46 vaccinating 46 bird flu pandemic 46 Cervarix 46 nasal spray 46 rubella 46 vaccinate 45 cervical cancer 45 vaccination 45 flu epidemic 45 Meningitis 45 respiratory illness 45 swine flu pandemic 44 hay fever 44 immunizations 44 Norovirus 44 meningitis 44 West Nile 44 Swine Flu 44 smallpox vaccine 43 WNV 43 vaccines 43 Relenza 43 virus 43 norovirus 43 pneumonia 43 antivirals 43 Chlamydia 42 C. difficile 42 immunized 42 rabies 42 immunization 42 swine flu outbreak 42 avian flu 42 Tamiflu 42 inoculations 42 human papilloma virus 42 superbug 41 Dengue 41 highly contagious 41 chicken pox 41 infections 41 antiviral drugs