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Noticing that some tumors afflicting horses and cattle occasionally disappeared spontaneously, he injected horses with Actinomyces bovis, the bacterium that causes a condition called “lumpy jaw.”

There are some diseases, as, for instance, Texas fever and rabies, which are caused by a minute animal parasite known as protozoa, while others again, like lumpy jaw and aspergillosis, are caused by fungi.

Young cattle that are replacing and erupting their teeth are most prone to "lumpy jaw."

Some of my cows have hard lumps on their jaws, or lumpy jaw.

In the United States, where the disease is known as "lumpy jaw" the jawbone is commonly affected.