Related by context. Frequent words. (Click for all words.) 78 swine flu 76 H#N# virus 74 H#N# flu 74 H#N# 73 bird flu 71 H#N# influenza 70 H#N# swine flu 68 swine flu virus 68 dengue 66 influenza 66 H#N# strain 65 bird flu virus 65 avian influenza 65 dengue fever 64 H#N# bird flu 64 Swine Flu 63 Swine flu 62 avian flu 62 bird flu outbreak 61 SARS 60 West Nile virus 60 flu 60 Dengue 59 whooping cough 59 Influenza 59 Bird flu 59 flu virus 57 West Nile 57 deadly H#N# strain 57 West Nile Virus 57 cholera 56 measles 56 bacterial meningitis 56 rabies 56 mumps 55 swine flu outbreak 55 Severe Acute Respiratory Syndrome 55 influenza virus 54 pertussis 54 WNV 54 virus 54 H#N# pandemic 54 meningitis 54 encephalitis 53 Flu 53 tuberculosis 52 pandemic influenza 52 XDR TB 51 swine flu pandemic 51 superbug 51 Bird Flu 51 flu epidemic 51 outbreak 50 influenza pandemic 50 pandemic 49 norovirus 49 highly contagious 49 respiratory illness 49 Sars 49 cholera outbreak 49 infections 49 Ebola 49 seasonal influenza 49 pandemic flu 48 chickenpox 48 communicable disease 48 mad cow disease 47 quarantined 47 disease 47 flu pandemic 47 salmonella 47 gastroenteritis 47 flulike symptoms 47 SARS virus 46 Hepatitis 46 drug resistant TB 46 chlamydia 46 outbreaks 46 infection 46 pneumonia 46 Tamiflu 46 MRSA 46 chicken pox 45 HIV 45 TB 45 anti viral 45 Health Organization WHO 45 seasonal flu 45 Rabies 45 flu viruses 45 infectious diseases 45 infectious disease 45 Health Organisation WHO 45 WHO 45 communicable diseases 45 HIV AIDS 45 malaria 44 typhoid 44 HIV infections 44 Tuberculosis 44 flu bug