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Their immune systems are pretty great at killing viruses and bacteria. Alligator serum is tough against: HIV, West Nile, and Herpes.

A long, but good read, on lizard immune systems can be found here[0].

[0]http://jeb.biologists.org/content/213/5/661

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Yet weirdly the Komodo Dragon lizard has so much bacteria in its mouth that is how it kills its prey. It just bites, and then waits around for the prey to die of infection.

I was under the impression this wasn’t really believed anymore. The only discussion I can find for it is here though:

http://phenomena.nationalgeographic.com/2013/06/27/the-myth-...

Wow interesting that's the first I had heard that the bacteria theory was discredited.

You see? You thought this was a cool FACT but turns out it's just a theory. Be careful about theories people have in biology or zoology.

I suppose their immune system also doesn't kill off their gut bacteria.

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