Cats will not get plague from eating rats because the rats themselves do not carry plague. Not all rats have plague. Rats are only the pathogen of plague. Therefore, if a rat is infected with plague, then the cat will eat it. Rats infected with plague will also get plague.
Tips:
It is best not to let cats eat mice to avoid poisoning or contracting diseases. Although mice can help cats supplement taurine, current cat food contains too much taurine. Sulfonic acid can already meet the needs of cats.