Related by context. Frequent words. (Click for all words.) 62 smallpox 59 small pox 54 Spanish flu pandemic 53 influenza epidemic 51 bubonic plague 48 potato famine 48 influenza pandemics 48 Civil War 47 Black Plague 47 flu epidemic 47 Spanish conquistadors 46 typhoid fever 45 Smallpox 45 yellow fever 45 Native Americans 45 colonists 45 leprosy 45 syphilis 44 #th century 44 scarlet fever 44 tuberculosis 44 Crimean War 44 influenza pandemic 43 outbreak 43 World War II 43 SARS epidemic 43 venereal disease 43 Revolutionary War 43 Boer War 43 flu pandemic 43 diphtheria 42 War I. 42 epidemic 42 typhus 42 epidemics 42 WWI 42 sixteenth century 42 disease 41 nineteenth century 41 mosquito borne virus 41 flu outbreak 41 measles outbreak 41 flu pandemics 41 measles 41 rheumatic fever 41 germ warfare 41 Napoleonic wars 41 Gulf War 40 pandemic 40 H#N# influenza virus 40 Napoleonic Wars 40 AIDS epidemic 40 Meriwether Lewis 40 Little Bighorn 40 pogroms 40 superbug 39 slave rebellion 39 avian flu outbreak 39 Middle Ages 39 WWII 39 typhoid 39 Dutch elm disease 39 H#N# viruses 39 WW II 39 venereal diseases 39 SARS outbreak 39 prehistory 39 tularemia 39 conquistadors 39 famines 39 parasitic disease 38 pandemics 38 mad cow disease 38 Crusades 38 seventeenth century 38 anthrax 38 Victorian era 38 slavery 38 C. diff 38 Pearl Harbor 38 infectious disease 38 colonization 38 H#N# virus 38 colonial rule 38 cholera outbreaks 38 mosquito borne illness 38 enslaved Africans 38 contagious disease 38 settlers 38 holocaust 38 Sars virus 38 anthrax scare 38 H#N# flu pandemic 37 7th Cavalry 37 asbestos contamination 37 smallpox vaccination 37 influenza 37 Colonists 37 contagious diseases 37 eighteenth century 37 Bolshevik revolution