Related by context. Frequent words. (Click for all words.) 56 influenza epidemics 54 Pandemics 52 pandemics 51 epidemics 50 influenza pandemics 49 Pandemic flu 48 respiratory viruses 48 influenza 48 flu pandemics 48 temperate regions 47 Seasonal influenza 47 temperate zones 47 seasonal influenza 46 flu strains 46 virulent strains 45 pandemic influenza 45 insect borne diseases 45 avian flu outbreaks 44 outbreaks 44 Testicular cancer 44 Influenza viruses 44 influenza viruses 44 PCV7 44 flu viruses 44 occurrence 44 measles outbreaks 43 heatwaves 43 H#N# pandemic 42 H#N# viruses 42 pneumococcal vaccination 42 pandemic 42 Chlamydia trachomatis 42 avian viruses 42 rotavirus infection 42 avian influenza viruses 42 flus 42 Spanish flu pandemic 42 pandemic H#N# 42 zoonotic disease 42 pandemic H#N# virus 41 hotter summers 41 Outbreaks 41 influenza pandemic 41 swine origin 41 prolonged droughts 41 highly pathogenic H#N# 41 pandemic H#N# influenza 41 Meningococcal disease 40 Predy 40 H#N# pandemic influenza 40 occur 40 influenza virus 40 avian flu viruses 40 respiratory syncytial virus 40 influenza strains 40 Seasonal flu 40 H#N# 40 transmissibility 40 onset 40 mosquito borne 40 virological 40 measles 39 oseltamivir Tamiflu 39 cholera outbreaks 39 bioterrorist attacks 39 Hantavirus 39 Ad# 39 CMV infection 39 RSV infection 39 contagions 39 pandemic flu 39 Infestations 39 seasonal flu 39 natural catastrophes 39 diarrheal illness 39 Lubroth 39 tick borne diseases 39 Epidemics 39 immunodeficiency 39 occurring 39 infected mosquitoes 39 northern hemisphere 39 natural disasters 39 CCHF 39 chemoprophylaxis 39 infects humans 39 Influenza 39 St. Louis encephalitis 39 famines 39 highly pathogenic strain 38 diarrheal 38 avian bird flu 38 Schuchat 38 H#N# strain 38 Antiviral drugs 38 harmattan 38 Tularemia 38 Infectious diseases 38 viral strains 38 Bubonic plague 38 herpes viruses