Tag Archive | "red necked keelback"

Snake Bite – Red-Necked Keelback – Rhabdophis subminiatus

A couple months back I received an email from a concerned father whose son was bitten by a red-necked keelback (Rhabdophis subminiatus) he had found in their neighbor’s garden.

“My son is suffering from non clotting, severe swelling, and paralysis and is now in ICU, where his vital and neuro signs are ok, but blood not good.”

These snakes have, in the past, not been identified as a dangerous snake. Many people have them as pets, and free-handle them with bare hands. Sometimes these snakes bite, but once they are handled a bit they usually calm down and rarely bite. There have been some cases in the literature where bites have resulted in hospitalization, and there has been a push to identify these snakes as what they are – venomous, and dangerous.

Colubrids, rear-fanged snakes, are nearly all venomous. Venom is modified saliva that helps the snake kill and break down the body of their chosen food.

I was excited to have a response from the father of this boy that spent 2 weeks in a Thailand hospital after suffering 2 bites from this snake.

Here’s what I learned after some questions by email…

1. Can you tell anything about how the bite occurred? Was the snake typically calm – and then, out of the ordinary behavior – it bit your son?

Calm, he was showing off to his friend’s that he can handle snakes, this was a wild one not a pet. He has a constrictor, a corn snake and a python as pets, all fairly placid, but the keelback he had no understanding of.

2. Approximately how long did the snake bite down on your son’s hand? Was it less than 1 second? 1-3 seconds? 3-5? 10? 60 or more? This is the most important question because in the past we haven’t seen enough venom transferred from quick bites, or even repetitive quick bites…

Between 30-40sec I believe, wouldn’t let go

3. Did the snake bite more than once that day?

Bit him twice within a few minutes.

4. Did the snake routinely bite your son – often?

First time.

5. Can you tell me approximately how long was the snake? Do you have any photos of it? Can you please send if you do?

No photo’s I’m afraid, he didn’t mention how long it was, but he will be back from school at the weekend, and I’ll fish more info out of him.

6. Did you get the snake in Thailand? There in Phuket, or where?

Wild snake in his friend’s garden.

*******

So, here again – the snake bit down for an extended period of time – 30+ seconds, and had time to squeeze a lot of venom into the boy’s hand.

There is no known anti-venin for the Rhabdophis subminiatus.

Venom Characteristics (from http://www.afpmb.org/content/venomous-animals-r#Rhabdophissubminiatus)

Mainly procoagulants, which can cause renal failure; plus mild neurotoxic factors. Envenomation does not always occur. Bite may be almost painless w/ minimal local swelling. Symptoms of envenomation may include local numbness, headache, nausea, & vomiting; in severe cases renal failure has caused human deaths. No known antivenom currently produced.

LD50 for intravenous injection – 1.29 mg/kg. That is extremely venomous…

This snake has no actual venom gland, but the venom resides in the saliva itself, and with a long bite – can envenomate a person, causing great harm.

Posted in Deadly Thailand Snakes, rear-fangedComments (9)

Red necked keelback (Rhabdophis subminiatus) is now classified as a deadly venomous snake.

Red Necked Keelback – Venomous – Dangerous

Red Necked Keelback Snake, venomous, Thailand and southeast Asia.

A beautiful snake, usually under 1 meter, not very aggressive.

Rhabdophis subminiatus (Red-Necked Keelback Snake)

Thai: (ngoo lay sab ko dang)

Length: Up to 130 cm (1.3 meters). Usually smaller than 1 meter.

Range: Thailand and southeast Asia.

Notes: These snakes are commonly found near water, lakes, ponds, and in gardens. Recently a friend had one in his swimming pool in Krabi town, southern Thailand.

Active Time? Daylight hours

Food: Frogs and fish primarily

Defensive Behavior: Spread out their neck slightly to make themselves appear bigger. Not as dramatic as a cobra. Lift their head and neck off the ground 4-5 inches.

Venom Toxicity: LD50 is 1.29 mg/kg for intravenous injection (source). That is about the same rating as the very deadly “Banded Krait (Bungarus fasciatus)”. It was previously thought these snakes were harmless. Some kept them as pets and were bitten. In one case the snake was left to bite for 2 minutes before removing it from a finger. Serious complications resulted requiring hospitalization and intensive care. Click for article. These snakes are rear-fanged and need to bite and hold on, or, repeatedly bite to have any effect on humans. Once they do either – there is the possibility of severe problems including renal failure and death. Recently a small boy of 12 years old was bitten by one in Phuket, Thailand and he is currently being treated (11/5/10). Be very careful not be be bitten by these snakes. There is NO ANTI-VENIN available yet for these snakes.

Another study in Japan ranked the venom as having an LD50 of 1.25 mg/kg for intravenous injection. (Japan Snake Institute, Hon-machi, Yabuzuka, Nitta-gun, Gunma-ken, Japan) V.1- 1969- Volume(issue)

Update: The 12 year old boy bitten by the Rhabdophis subminiatus was treated for 2 weeks of intensive care, and released. He was bitten multiple times, the 2nd bite lasting over 20 seconds.

Offspring: I have a juvenile red-necked keelback at the moment but I got it after the fact – found in the wild. Will find more info to put here.

Notes: These snakes can inflict a deadly bite when they are allowed to bite for longer than a couple of seconds. I know personally 2 instances where a child was bitten for well over 20 seconds, and a man was bitten for about a minute. Neither wanted to hurt the snake to remove it forcibly, and both spent over a week in intensive care, with the possibility of renal failure and death. Do not play with these snakes. If you have one, do not free-handle it. Treat it like you would a pit viper or a cobra. The LD50 on this snake for intravenous was stated to be 1.29 mg/kg. That is VERY venomous.

Classification:

Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Colubridae
Genus: Rhabdophis
Species: Rhabdophis subminiatus

Red Necked Keelback video

Red Neck Keelback Snake┬ávideo – This is another red-necked keelback (adult) that I had for a while. I’ve since let it go back into the wild.

 

Posted in rear-fangedComments (13)


 
 
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Thailand Snakes

 

Cobras in the HOUSE!

Welcome to Thailand Snakes…

Thailand has 200+ snake species with over 60 of them - venomous. I created this site as a way to educate Thais and visitors to Thailand about snakes. Many people kill the snakes they see in Thailand, while in many cases - they are non-venomous and completely harmless. With this site I hope to give people a better idea what is harmful and what isn't.

Browse the many snake photos and videos here so you can identify snakes you see on your porch, in your bed, or underfoot.

If you have been bitten by a snake - go to a hospital FIRST. Don't waste time looking it up on the internet. With some snakes you need to have medical help as fast as possible. With others you have some time. I know a Thai man whose brother died in less than 10 minutes from a snake bite.

There are venomous (some say 'poisonous' erroneously) snakes everywhere in Thailand. Friends have had cobras in their kitchen, and others had kraits in the garage. Vipers love bushes and trees near water and walkways.

Bookmark this site so you can quickly identify snakes you have seen. Notice the variety of venomous and non-venomous snakes in Thailand - and realize that they come in all sizes, shapes, colors, and patterns.

Email - info@thailandsnakes.com

Thailand’s Deadly Snakes