What Happened to Mad Cow Disease?

If you were around in the '90s, you might remember the scare over mad cow disease, but it seems to have quieted down in the intervening years. What happened?

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Sources:
http://www.oie.int/en/animal-health-in-the-world/bse-specific-data/number-of-cases-in-the-united-kingdom/
https://www.cdc.gov/prions/bse/about.html
http://www.bseinfo.org/bseclinicalsignssymptoms.aspx
https://www.scientificamerican.com/article/what-is-a-prion-specifica/
http://www.hopkinsmedicine.org/healthlibrary/conditions/nervous_system_disorders/prion_diseases_134,56/
http://www.mayoclinic.org/diseases-conditions/creutzfeldt-jakob-disease/basics/definition/con-20028005
https://www.fda.gov/BiologicsBloodVaccines/BloodBloodProducts/QuestionsaboutBlood/DonatingBlood/
http://www.who.int/mediacentre/factsheets/fs180/en/
https://www.cdc.gov/prions/vcjd/vcjd-reported.html
https://www.cdc.gov/prions/vcjd/risk-travelers.html
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Images:
https://en.wikipedia.org/wiki/File:Aphis.usda.gov_BSE_5.jpg

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