Related by context. Frequent words. (Click for all words.) 75 mutate 74 mutates 64 pandemic strain 63 flu viruses 63 influenza virus 62 flu virus 61 mutating 60 influenza viruses 58 H#N# strain 57 flu strains 57 virus 57 bird flu virus 55 infect humans 55 pandemic 54 swine flu virus 53 avian flu 52 malaria parasite 52 influenza 52 influenza pandemic 52 flu pandemic 52 H#N# virus 51 highly contagious 51 viruses 50 bacterium 50 H#N# 50 mutated 49 seasonal flu 49 mosquito borne disease 48 bird flu 48 seasonal influenza 47 avian influenza 47 Influenza 47 drug resistant TB 47 pandemic flu 47 H#N# bird flu 47 H#N# swine flu 46 pathogen 46 bird flu pandemic 46 human immunodeficiency virus 46 germs 46 contagious disease 45 mutation 45 infects 45 flu 45 pathogens 45 pandemic influenza 45 pandemics 45 Ebola 45 vaccine 45 bacteria 44 resistant bacteria 44 SARS virus 44 antiviral drugs 44 infected 44 infect 44 superbug 44 epidemics 44 Ebola virus 44 pertussis 44 organism 43 Bird flu 43 swine flu 43 disease 42 Viruses 42 XDR TB 42 encephalitis 42 H#N# influenza 42 West Nile virus 42 meningococcal disease 42 swine flu pandemic 42 microbe 42 parasite 42 mutations 42 bacterial meningitis 42 HPV 42 staph 42 H#N# flu 42 HIV 42 infectious disease 42 unvaccinated 42 germ 41 West Nile 41 oseltamivir 41 flu vaccines 41 fungus 41 anti viral 41 MDR TB 41 evolves 41 WNV 41 HIV infection 41 Flu 41 chickenpox 41 dengue 41 Tamiflu 41 antibiotic resistance 41 pathogenic 41 bacterial infection 41 Measles 41 whooping cough 41 virulent 41 flu epidemic