Komodo dragons have 57 virulent bacteria in their saliva

Komodo dragons also possess virulent bacteria in their saliva, of which more than 28 Gram-negative and 29 Gram-positive strains have been isolated.^[25] These bacteria cause septicemia in their victim; if an initial bite does not kill the prey animal and it escapes, it will commonly succumb within a week to the resulting infection. The most harmful bacterium in Komodo dragon saliva appears to be a deadly strain of Pasteurella multocida, from studies performed with laboratory mice.^[26] There is no specific antidote to the bite of a Komodo dragon, but it can usually be treated by sterilizing the wounded area and giving the patient large doses of antibiotics. If not treated promptly, gangrene can quickly develop around the bite, which may require amputation of the affected area. Because the Komodo dragon appears immune to its own microbes, much research has been done searching for the antibacterial molecule(s) in the hopes of human medicinal usage.^[27]

^{http://en.wikipedia.org/wiki/Komodo_dragon}