Related by context. Frequent words. (Click for all words.) 80 SARS 79 Severe Acute Respiratory Syndrome 75 SARS virus 71 severe acute respiratory 64 Sars 60 swine flu outbreak 56 outbreak 56 bird flu outbreak 52 swine flu pandemic 52 flu pandemic 51 avian flu 51 H#N# virus 50 H#N# flu 50 influenza pandemic 49 bird flu 49 H#N# 48 swine flu virus 48 pandemic 47 economic downturn 47 downturn 47 swine flu 46 C. difficile 46 recession 46 avian influenza 46 H#N# swine flu 46 outbreaks 45 mad cow 44 superbug 43 H#N# influenza 43 bird flu virus 43 dengue 42 Hong Kong 42 flu 42 subprime mortgage crisis 42 influenza 42 mad cow disease 42 flu virus 42 credit crunch 42 slowdown 41 virus 41 dengue fever 41 pandemic flu 40 respiratory illness 40 quarantines 39 pandemics 39 Cultural Revolution 39 Tung 39 dot com bust 39 pandemic influenza 39 crisis 39 West Nile virus 39 Guangdong province 38 norovirus 38 typhoons 38 typhoon 38 cholera outbreak 38 Ebola 38 Swine Flu 38 communicable diseases 38 H#N# bird flu 38 Bird flu 38 Gulf War 37 Guangdong 37 Great Recession 37 H#N# strain 37 Swine flu 37 infectious disease 37 infection 37 AIDS epidemic 37 influenza virus 37 seasonal influenza 37 terrorist attacks 37 quarantine 37 epidemics 36 bedbugs 36 Tsang 36 flu viruses 36 recessions 36 infectious diseases 36 Influenza 36 bed bugs 36 WHO 36 Hurricane Katrina 36 smallpox 36 downturns 36 West Nile 36 Bird Flu 36 epidemic 35 E. coli outbreak 35 natural disasters 35 deepest recession 35 Sichuan 35 Chan 35 Taipei 35 infections 35 Flu 35 Beijing 35 Taiwan 35 MRSA 35 West Nile Virus 35 Tiananmen