Related by context. Frequent words. (Click for all words.) 68 swine flu pandemic 67 pandemic 67 H#N# flu 66 H#N# swine flu 65 influenza pandemic 65 swine flu outbreak 65 pandemic flu 64 flu pandemic 62 pandemic influenza 62 H#N# influenza 62 H#N# 61 H#N# virus 60 swine flu virus 60 influenza 59 avian flu 59 swine flu 57 SARS outbreak 57 flu 57 outbreak 56 SARS 56 Severe Acute Respiratory Syndrome 55 Swine Flu 55 flu virus 54 bird flu outbreak 54 epidemic 54 Swine flu 54 Flu 53 seasonal flu 53 seasonal influenza 53 bird flu 53 superbug 52 SARS virus 52 infectious disease 52 avian influenza 51 C. difficile 51 Influenza 51 pandemics 49 influenza virus 49 anti viral 49 epidemics 48 H#N# vaccine 48 West Nile virus 48 whooping cough 48 infectious diseases 48 virus 47 Tamiflu 47 swine flu vaccine 47 H#N# strain 46 smallpox 46 antivirals 46 bird flu virus 46 infections 46 outbreaks 46 pertussis 45 Bird flu 45 antiviral drugs 45 vaccine 45 cholera outbreak 45 MRSA 45 flu bug 45 dengue 45 flu vaccine 44 dengue fever 44 bioterrorism 44 Dengue 44 West Nile Virus 44 Sars 44 H#N# bird flu 44 severe acute respiratory 44 mumps 43 flu vaccines 43 measles 43 antiviral 43 West Nile 43 flu viruses 43 Ebola 43 norovirus 43 cholera 43 economic downturn 43 AIDS epidemic 42 vaccination 42 influenza vaccine 42 Hepatitis 42 viruses 42 influenza viruses 42 disease 41 Relenza 41 communicable diseases 41 infection 41 inoculation 41 Bird Flu 41 recession 41 vaccines 40 crisis 40 viral infections 40 antibiotic resistance 40 bacterial infections 40 cholera epidemic 40 WHO 40 Pandemic 40 chronic diseases