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Fear over mad cow disease , or bovine spongiform encephalopathy , arose in the mid-1990s when Britain discovered a new version of the human Creutzfeldt-Jakob disease apparently was caused by eating infected beef . Identifying the many genetic factors underlying conditions such as cancer and heart disease poses a much bigger challenge to geneticists than rare disorders such as Huntington 's disease and cystic fibrosis , which are always traceable to a single genetic defect . First , the repeat region can be deleted altogether and prion disease can still occur in animal models . Oral health disease is preventable and the Seal a Smile program is one of Wisconsin 's key programs targeting kids oral health . In this same period , as the first news on this disease in the United Kingdom arrived , approximately 8,000 to 10,000 people had died of meningitis in eastern , pardon me , western Africa [ words indistinct ] without medical attention .