Related by context. Frequent words. (Click for all words.) 81 A/H#N# flu 73 H#N# virus 71 H#N# influenza 70 H#N# 70 swine flu 70 H#N# flu 70 H#N# influenza virus 67 bird flu 67 H#N# swine flu 66 swine influenza 66 avian influenza 65 H#N# avian influenza 65 swine flu virus 65 influenza 63 bird flu virus 63 SARS 63 Dengue fever 63 avian flu 62 dengue 62 dengue fever 61 bird flu outbreak 61 H#N# strain 60 H#N# bird flu 59 mosquito borne disease 59 Severe Acute Respiratory Syndrome 59 Influenza 58 Swine Flu 58 bird flu outbreaks 58 dengue cases 58 chikungunya 57 tuberculosis TB 57 flu virus 56 Avian Influenza 56 deadly H#N# strain 56 Dengue 56 meningococcal disease 56 West Nile virus 56 virus 55 influenza virus 55 leptospirosis 55 flu 54 cholera 54 mumps 54 tuberculosis 54 Sars 54 West Nile Virus 54 contagious disease 54 pandemic influenza 54 Swine flu 53 Bird flu 53 XDR TB 53 measles 53 H#N# pandemic 53 Avian flu 53 whooping cough 52 outbreak 52 rabies 52 infections 52 WNV 52 pertussis 51 Health Organization WHO 51 pandemic 51 swine flu outbreak 51 communicable disease 51 swine flu epidemic 51 infected 51 Health Organisation WHO 51 superbug 51 bacterial meningitis 51 West Nile 51 infection 50 Ebola 50 SARS virus 50 mad cow disease 50 communicable diseases 50 MDR TB 50 monkeypox 50 respiratory illness 50 influenza pandemic 50 oseltamivir 50 bovine spongiform encephalopathy BSE 49 highly contagious 49 HIV 49 Legionnaires disease 49 vCJD 49 cholera outbreak 49 seasonal influenza 49 Avian Flu 49 HIV infection 49 disease 49 Tamiflu 49 Bird Flu 48 flu viruses 48 typhoid fever 48 swine flu pandemic 48 WHO 48 Health Organisation 48 meningitis 48 NDM 1 48 coronavirus 48 contagious diseases