Related by context. Frequent words. (Click for all words.) 67 whooping cough 59 Whooping cough 58 mosquito borne disease 58 H#N# swine flu 57 swine flu 57 H#N# pandemic 57 West Nile virus 56 measles 55 epidemic 55 Swine flu 55 pertussis 54 H#N# flu 53 A/H#N# flu 53 H#N# 52 West Nile 52 swine flu virus 52 Japanese encephalitis 52 meningococcal disease 51 swine flu pandemic 51 H#N# influenza 51 West Nile Virus 51 H#N# virus 51 influenza 51 swine flu outbreak 51 flu epidemic 51 mumps 50 Swine Flu 50 outbreak 50 flu 50 Pertussis 49 heatwave 49 pandemic 49 flu pandemic 49 pandemic H#N# 49 Flu 49 H#N# influenza virus 49 swine flu vaccination 49 Bird flu 48 flu vaccination 48 seasonal flu 48 chickenpox 48 dengue cases 48 bird flu outbreak 48 cholera outbreak 48 dengue fever 48 Dengue fever 48 outbreaks 48 dengue 48 influenza pandemic 47 A/H#N# 47 swine flu epidemic 47 vaccine preventable diseases 47 Seasonal flu 47 epidemics 47 vaccinated 47 bird flu 46 AIDS epidemic 46 immunization 46 chlamydia 46 Avian flu 46 flu pandemics 46 avian flu 46 meningitis 46 H#N# avian flu 46 flu vaccinations 45 superbug 45 Measles 45 obesity epidemic 45 vaccinate 45 E. coli infection 45 waterborne disease 45 seasonal influenza 45 rabies 45 H#N# vaccination 45 vaccinations 45 vaccination 45 Mumps 45 bacterial meningitis 44 immunizations 44 H#N# strain 44 cholera 44 WNV 44 flu virus 44 bird flu outbreaks 44 swine flu vaccine 44 bird flu pandemic 44 swine influenza 44 avian influenza 44 highly contagious 44 Childhood obesity 44 Dengue 44 encephalitis 44 bird flu virus 44 Outbreaks 43 HIV infections 43 vaccinating 43 virus 43 immunized 43 chicken pox 43 respiratory illness 43 salmonella