The threat of rabies.
D000293:Adolescent; D000818:Animals; D002648:Child; D002675:Child, Preschool; D004196:Disease Outbreaks / Q000453:epidemiology* / Q000266:history; D004197:Disease Reservoirs; D004285:Dogs / Q000382:microbiology; D005060:Europe; D005260:Female; D005589:Foxes / Q000382:microbiology; D049668:History, 15th Century; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049691:History, Medieval; D006801:Humans; D007223:Infant; D008297:Male; D011818:Rabies / Q000453:epidemiology* / Q000266:history / Q000517:prevention & control; D006113:United Kingdom