In reality it isn't fatal for the cows and it isn't a health risk to humans. This disease affects nearly all cloven-footed mammals, including cattle, sheep, swine, goats, bison, antelope, deer, reindeer, camel, llama, giraffe and elephants.
Horses are resistant.
In surviving cows the flow of milk is greatly reduced, and abortions are common. Aside from the death to cows, farmers lose money. As you know when farms go broke people suffer both psychologically and financially. Child abuse goes up, as does alcoholism, divorce, suicide, etc., etc. While it may not be contagious to humans, it does indirectly affect their health.