Related by context. Frequent words. (Click for all words.) 90 avian flu 88 avian influenza 86 bird flu virus 86 H#N# bird flu 84 bird flu outbreak 81 H#N# virus 79 Bird flu 79 H#N# 76 H#N# strain 73 swine flu 72 Bird Flu 68 H#N# flu 67 swine flu virus 66 SARS 65 influenza 65 H#N# swine flu 64 flu 64 flu virus 63 H#N# influenza 63 Swine Flu 62 dengue 62 dengue fever 62 virus 61 flu pandemic 61 Severe Acute Respiratory Syndrome 61 West Nile virus 60 mad cow disease 60 Swine flu 60 rabies 60 pandemic flu 60 West Nile 59 Ebola 59 influenza virus 59 pandemic 59 influenza pandemic 58 SARS virus 57 West Nile Virus 57 Influenza 57 mad cow 57 outbreak 57 poultry 56 swine flu pandemic 56 cholera 56 Flu 55 swine flu outbreak 55 measles 55 poultry farms 55 Sars 54 superbug 54 disease 53 flu viruses 53 CWD 53 whooping cough 53 tuberculosis 53 polio 53 malaria 53 Rabies 52 salmonella 52 meningitis 52 Tamiflu 52 TB 51 cholera outbreak 50 outbreaks 50 WHO 50 infectious disease 49 SARS outbreak 49 infection 49 MRSA 49 highly contagious 49 mumps 49 Tuberculosis 48 communicable diseases 48 severe acute respiratory 48 encephalitis 47 seasonal flu 47 Salmonella 47 Hepatitis 47 infectious diseases 47 HIV 47 HIV AIDS 47 pertussis 47 anti viral 46 AIDS 46 swine flu vaccine 46 vaccination 46 Health Organisation WHO 46 fowl 46 Malaria 46 cervical cancer 46 vaccine 46 vaccines 46 infections 45 Lyme disease 45 epidemics 45 chickens 45 smallpox 45 vaccinate 45 Health Organization WHO 45 E. coli 45 antiviral drugs 44 respiratory illness