What mammal has the "dirtiest" mouth/bite?

While this very long and scholarly article does not say which animal, mammal or non mammal, has the "dirtiest" mouth/bite, it does state that a bite from a human is more likely to become infected.

Excerpt:

Human bites tend to have a higher complication and infection rate than animal bites, with approximately 10-15% of human bites becoming infected.[9]

http://www.medscape.com/viewarticle/739023_1

And I found this statement in one of the conclusing paragraphs interesting -

As we continue to improve methods in trauma care, survival from major animal attacks has increased. This has resulted in a higher rate of infection (along with the evaluation of the oral microbiology of biting animals), but has also given scientists the opportunity to better prevent and, if needed, treat infected bite wounds.