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Venomous Lizards

thebiologist Jun 07, 2006 11:44 AM

I have been asked the following question many many times in last few weeks, by my fellow New Yorkers, what lizards are actually venomous?? Im being asked this question becuase in Janurary of this year the New York government released its list of illegal reptiles and all venomous lizards are listed, but it does not mention what lizards are venomous.Thats a loaded question, all lizards carry a certain level of bacteria in their mouths, some more than others. Take the komodo dragon for instance, the levels of bacteria are so high a bite can cause death rapidly due to a blood infection. But what lizards are truly venomous? Only 2, there are only 2 known truly venomous lizards, the first is the majestic Gila Monster, and the second is the deadly but cute Beaded lizard. Steve Angeli a dear friend and fellow researcher of mine knows first hand.

What follows is an actual first hand account of a bite from a juvenile beaded lizard. 06/21/00 I was feeding my juvenile beaded lizards (the animal that bit me hatched 2-25-00). They had mouse-tails hanging from their mouths. I went to move one of them, so I could change their water. One swung around and I was bitten on the right thumb. The animal hung on for 5 to 10 seconds, then released. I experienced extreme pain immediately, with swelling. The pain became excruciating within 5 minutes. At 10 minutes I took 3 Vicodine and 1800 mg of Ibuprophen (I had left over from a dental prescription). At 15 minutes the swelling in my hand, fingers and wrist increased. The pain and swelling was starting up my arm. Within 30 minutes after the bite the pain began to radiate up my arm into my armpit. I experienced no other symptoms in any other part of my body, and no systemic reaction. One and a half hours the swelling was increasing half way up the forearm and my hand was feeling like it was going to explode, pain killers helping.

6-22 0800AM Swelling all the way to elbow with pain in hand, arm, and armpit area. The pain was intense enough that I went to the Doctor. They never had a case of this sort, so I advised them to call Arizona Poison Control Center. My Doctor got some tape messages and finally got someone who knew something about the needed treatment (ED: AZ has Gila Monsters, with similar venom). They then told my Doctor if there was no systemic reaction (i.e. vomiting, dizziness, accelerated heart rate, etc) that he would probably only have to treat me for infection and pain. I was given 750 mg Vicodine for pain, a tetanus shot, and two antibiotics (Augmentin-Amoxcillin 875mg and Clavolanic-Cipro 750mg) twice a day for 10 days. 5pm 6-22 Swelling starting to subside, still taking pain meds. 9pm swelling subsiding, but still at about 80%.

06/23/00 0800 AM Decided to go to work. Swelling still at about 60%, stopped taking pain meds. 5pm swelling down to about 40%, but still very sensitive to the touch. Swelling seems worse at the top of the forearm, not so much at the thumb where bitten. 8pm swelling down to about 20%, area still sensitive to the touch. 10 pm swelling almost gone from hand, but still sensitive to the touch. Forearm still swollen. 10pm lifted weights at the gym until 11pm. Had numbness in right side of right hand, but worked out anyway.

06/24/00 0600AM swelling mostly gone but top of hand and forearm still sensitive to the touch. 9PM swelling gone but still experiencing sensitivity on the top of my hand and forearm. Some periodic numbness on right side of hand and pinkie finger.

06/28/00 One week later the top of my hand and forearm still sensitive to the touch, but have been using my arm normally since 6-23 6-28 7-5 symptoms gone!

The foregoing has been an account of a bite, as told by Steve Angeli to Robert Applegate. It should be noted that this was a very small lizard of a species that grows to exceed 3 feet in length, and another individual may be more or less sensitive to the venom. Any bite from a Heloderma lizard should be considered a very serious medical emergency and medical treatment should be sought immediately. In no way are we condoning self prescribing medications, this is just an account of what really happened, not necessarily the recommended way it should have been taken care of.

Replies (4)

VaraNY Jun 07, 2006 11:53 AM

Actually the ban was in 05'

BGF Jun 07, 2006 12:08 PM

A very valid concern as the intent of the legislation rarely reconciles with the biological reality. In the case of lizards, many more species are venomous other than the heloderms, however this is venom from an evolutionary perspective not from an medically important standpoing. The other anguimorph lizards (e.g. alligator lizards, anguids, european legless lizards, galliwasps, varanids etc.) all possess the same compound mandibular venom gland as the heloderms and produce very similar venoms. However, the medical implications are trivial. So from a practical (e.g. legislative) perspective they should be placed along side the truly non-venomous lizards (e.g. skinks, geckos) and not in the same category as heloderms. The iguanids are even less 'venomous' in that they possess a very very primative form of the gland on both the maxillary and mandibular jawbones but the glands are absolutely inconsequential. So they too should be legislatively considered as 'non-vennomous'.

Below is the link to download the PDF of our recent paper in 'Nature' on this subject.

Cheers
Bryan
Early evolution of venom in reptiles

-----
Dr. Bryan Grieg Fry
~~~~~~~~~~~~~~~~~~~~~~
Australian Venom Research Unit,
University of Melbourne
~~~~~~~~~~~~~~~~~~~~~~
Population and Evolutionary Genetics Unit,
Museum Victoria
~~~~~~~~~~~~~~~~~~~~~~
http://www.venomdoc.com

mkper5 Jun 07, 2006 12:39 PM

Hello, thanks for the info, the way to tell if something is venomous or not is simple in my opinion. An animal that is venomous uses its venom to help or entirely subdue its prey. All animals have saliva and all contain bacteria. I would not consider bacteria a venom, however some bacteria do create harmful chemicals but in order to be venomous I would think the animal itself should produce the venom. That is my view but it does have its faults. The blue ring octopus uses bacteria for deadly chemicals and is considerd venomous. As far as monitors saliva being venomous, I would not think so but I am sure it does have certain compounds in it that with millions of years evolution could turn into a venom. Thanks

FR Jun 07, 2006 12:49 PM

As a person who has worked with gilas for decades, and been around others who have been bitten by both gilas and beadeds. That discription was very accurate. It was about what happened in each case. Pain swelling, not systemic. The pain as in real pain. hahahahahahahahaha(I have been fortunate to not have experienced this particular event)

I would think most all reptiles have chemical qualities that adversely effect human biology, to some extent. The recent publication of crotimines in colubrid saliva and in varanid saliva, is an indication that the line between what we call venomous and non-venomous is not very clear.

The line is also clouded by possibilities. Most people do not experience deleterious effects from varanid saliva or colubrid saliva. But a few do. Some(a very few) experience symtoms very similar to what you just published.

I once attended a talk by Dr. Finly Russel(venomolgist) He show cases of extreme envemonation from gartersnakes, gophersnakes etc. Symtoms very similar to rattlesnake envemonation(something I do have experience with) Cheers

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