What does the word 'pestilence' mean in Edgar Allan Poe's "The Black Cat"?

For my own part, I soon found a dislike to it arising within me. This was just the reverse of what I had anticipated; but - I know not how or why it was - its evident fondness for myself rather disgusted and annoyed. By slow degrees, these feelings of disgust and annoyance rose into the bitterness of hatred. I avoided the creature; a certain sense of shame, and the remembrance of my former deed of cruelty, preventing me from physically abusing it. I did not, for some weeks, strike, or otherwise violently ill use it; but gradually - very gradually - I came to look upon it with unutterable loathing, and to flee silently from its odious presence, as from the breath of a pestilence.