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#7058646 - 01/30/18 12:05 PM Chronic Wasting Disease A Time Bomb For Agriculture?
flounder Offline
Bird Dog

Registered: 10/29/11
Posts: 266
Loc: 77518
WOW, i am shocked, this came from the PORK farm journal...

Chronic Wasting Disease A Time Bomb For Agriculture?

Chris Bennett, Farm Journal Media
January 30, 2018 11:25 AM

“Everyone at least needs to wake up to the potential of CWD to move in crops because it would shake up agriculture as we know it,” says David Clausen. ( © Herbert Lange, WDNR )
Is chronic wasting disease (CWD) a potential time bomb for the agriculture industry? A silent killer stalking deer and elk, CWD continues to move quietly across the U.S., with 22 states currently reporting CWD presence in free-ranging cervids.

CWD is a neural malady with devastating final-stage symptoms akin to mad cow disease. There is no direct proof of transmission via contaminated grain or feedstuffs, but researchers say accumulating evidence warrants a closer look at the possibility for potential disruption of multiple facets of the agriculture industry.

CWD is a guarantee of protracted death. Without exception, host deer slowly enter a zombie-like state characterized by extreme thirst, lack of mobility, loss of balance and near-total disorientation. CWD plays by a unique set of disease rules and does not spread by the common modes of infection (bacteria or virus), but is transmitted by a corrupted prion, essentially a misfolded protein. The corrupted prions multiply until the infection reaches the brain, destroying cells and attacking the central nervous system. Brain cells die in response to the presence of prions, creating holes in the brain.

“It’s a bad way to die. The animals are emaciated and waste away, and ultimately die from aspiration pneumonia because the swallowing reflex is affected and saliva gets into the lungs, or they freeze to death because they have no more body fat,” says Tracy Nichols, a molecular biologist and staff officer with USDA’s Veterinary Services Cervid Health Program in Fort Collins, Co.

On average whitetail deer have an approximate two-year CWD incubation period from infection to death. Although deer appear and act healthy for the vast majority of the disease duration, they can transmit CWD during nearly the entire span. (It is detectable in bodily fluids from infected animals as early as three months.) Deer directly contract CWD through infectious saliva, feces and urine, or indirectly via soil ingestion, foraging or a water source contaminated with prion proteins.

After initial detection in 1967 at a Colorado captive mule deer facility, CWD spread with a slow, but sure pace. Fifty years later, CWD has infected cervid populations in 181 counties across 22 states, according to the Centers for Disease Control and Prevention (CDC).

The geographic footprint of CWD continues to swell, likely through two different functions. One, slow diffusion from deer to deer in the wild. Two, faster movement through human-assisted spread by captive cervid farms or hunter-transported carcasses.

LANGE
Deer appear and act healthy for the vast majority of CWD duration, but can transmit the disease during nearly the entire span.

© HERBERT LANGE, WDNR

There are no known cases of natural transmission of CWD to domestic livestock. However, in laboratory conditions, CWD has been reproduced experimentally in cattle and swine, and research studies continue to examine crossover possibilities. There is no evidence of human crossover of CWD, although a 2017 studydocumented oral transmission of CWD to macaque monkeys. (Conducted in Canada, the study awaits peer review and publication.) Since 1997, the World Health Organization (WHO) has called for the exclusion of all prion disease material from the human and animal food chains.

“Mad cow disease crossed the species barrier to humans, but we haven’t seen evidence of CWD crossover. We can’t say crossover won’t happen in time, and as a precautionary measure WHO doesn’t want infected prions in the human or animal food chains,” says Bryan Richards, chronic wasting disease project leader for the U.S. Geological Survey (USGS) National Wildlife Health Center in Madison, Wis.

The possibility of CWD transmission beyond cervid populations remains an unanswered question, partly because different strains of CWD behave distinctly. “There is so much about CWD transmission we don’t know and so much yet to be studied. There are so many CWD unknowns related to brain matter, infectivity, prion stage, lymph nodes and more,” says David Clausen, a retired Wisconsin veterinarian, farmer, and former chair of the Wisconsin Natural Resources Board. Clausen presently serves as board president of Midwest Environmental Advocates.

The infectivity range of CWD is another significant unknown. When one species door is closed, another may serve as a Trojan horse. Hamsters were originally thought to be immune to CWD, while ferrets were easily infected. “Take deer CWD and infect the ferret. Take the ferret CWD and infect the hamster. Boom. The hamster can’t be infected by the deer, but is susceptible to the ferret. These prions are constantly evolving and changing,” Clausen explains.

“The question is sitting there: If CWD is able to get into livestock or swine, could it be transmitted in feedstuffs?” he adds.

Echoing Clausen’s query, is CWD passed along in agricultural plant matter exposed to urine, feces or carcass material? Prions form a chemical bond with plant surfaces and also bind to some soil particles, according to Richards. “After dipping plant leaves in prion proteins, researchers haven’t been able to wash off the prions. There isn’t enough science yet, but it’s been shown that plants can pick up proteins in the soil matrix through their roots and deposit those proteins in shoots and leaves, likely in flowers as well,” he explains. “Is the infectivity still there and is the concentration enough to transmit disease?”

USGS
CWD has infected cervid populations in 181 counties across 22 states, according to the Centers for Disease Control and Prevention.

© USGS

Uptake in a laboratory isn’t real-world confirmation, but Richards finds the implications disturbing. In addition, CWD expansion across the U.S. compounds the infectivity issue. “With the geographic footprint of CWD greatly expanded, we have to ask if plant material really moves infectious material. We have to contemplate the question because agriculture would be such a huge mechanism for disease movement,” he says.

In theory, take a county with a 40% CWD rate in a whitetail population. If 20 whitetail typically feed in-and-out of a given wheat field, eight of those deer are CWD-positive. An adult deer defecates roughly 12 times per day and urinates at a higher frequency. After harvest, if the wheat straw is rolled, statistical probability places a good deal of fecal material in the bales. “It’s not a far-fetched idea for infectious material to move in agricultural commodities,” Richards says. “This is not really on the ag industry radar, but it comes up regularly in conversations among scientists. We don’t know if transmission happens, but it must be kept on the radar screen.”

“There was once a time when people said mad cow disease could never cross the species barrier. Almost 300 human deaths and an industry disaster later, it’s pretty simple to see why we keep on conducting the science and relying strictly on what the evidence shows,” he adds.

Nichols cites several studies where plant roots grown in hydroponic or spiked soil solutions were exposed to CWD material. The stem and leaf tissue subsequently tested positive for infected prions, despite no contact with the CWD material. However, high levels of laboratory exposure don’t necessarily equate with field environments. “The results are disconcerting, but what really matters is what happens in the real world. The next level of inquiry is to find out if there is any threat via agriculture crops,” Nichols says.

“There is no scientific conclusion, but the questions raised could impact international trade. Right now, we don’t know what, if any, threat exists,” she continues.

Clausen takes a dim view of CWD containment and believes the disease will continue to creep into additional states: “I’m a country boy. Basic epidemiology of disease control is to contain and quarantine. Deer farm or deer carcass, we have to prevent the movement of all CWD material, dead or alive.”

LANGE
“With the geographic footprint of CWD greatly expanded, we have to ask if plant material really moves infectious material. We have to contemplate the question because agriculture would be such a huge mechanism for disease movement,” says Bryan Richards, USGS.

© HERBERT LANGE, WDNR

It is incumbent on the agriculture industry to consider the ramifications of CWD spread through agricultural commodities, according to Clausen. “Sometimes we just seem to bounce from crisis to crisis without enough preparation or foresight. Corn or alfalfa, CWD uptake has been demonstrated in plants. Whether the uptake is infectious, that research hasn’t been done.”

“Everyone at least needs to wake up to the potential of CWD to move in crops because it would shake up agriculture as we know it,” Clausen says. “We’re all responsible to take a precautionary approach and consider what could happen.”


https://www.porkbusiness.com/article/chronic-wasting-disease-time-bomb-agriculture


kind regards, terry

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#7058655 - 01/30/18 12:11 PM Re: Chronic Wasting Disease A Time Bomb For Agriculture? [Re: flounder]
Sneaky Online   content
The "Grouch"

Registered: 10/22/12
Posts: 18422
Loc: Winters
Here we go again.
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#7058662 - 01/30/18 12:14 PM Re: Chronic Wasting Disease A Time Bomb For Agriculture? [Re: flounder]
2Beez Offline
Chihuahua

Registered: 07/17/15
Posts: 9124
Loc: Lake Texoma, TX
popcorn
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#7058747 - 01/30/18 01:24 PM Re: Chronic Wasting Disease A Time Bomb For Agriculture? [Re: flounder]
jmh004 Offline
Tracker

Registered: 10/01/14
Posts: 505
Hey this guy isn't afraid to cite from wikipedia. Just saying.

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#7058820 - 01/30/18 01:58 PM Re: Chronic Wasting Disease A Time Bomb For Agriculture? [Re: flounder]
okietex Offline


Registered: 03/27/09
Posts: 790
Can I get cliff notes?

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#7058954 - 01/30/18 03:36 PM Re: Chronic Wasting Disease A Time Bomb For Agriculture? [Re: flounder]
Duck Buster Offline
Tracker

Registered: 01/09/12
Posts: 691
Loc: Yukon Delta, Alaska
Why are you surprised it came from a pork farm journal? They care about their crops, and they're becoming informed. Pork are fed grains, so it makes sense.

back

I find it interesting they are conducting this research. When I was working for TPWD this was a question I got regularly. It is a question people ask...how long does it stay infectious in nature, and can their animals get it if it is on a plant or on the ground? Its not that far of a step to ask if a plant can absorb and then spread the disease after being eaten, because of how long it persists in nature.

Zoonotic diseases can be a real threat. Better to know this now, than when its too late. Do you really want alfalfa or other grains to come from Montana or Idaho or Colorado or midwest with high rates of CWD, knowing that plants can be a carrier for cwd, or there is fecal matter from an animal with CWD, then feed it to your livestock? Or it being fed in feedlots to the beef you buy at the store?

Or don't even discuss it going from cervids to hogs or beef or goats- what about CWD fecal matter on deer corn that you put in your feeder, and infect your deer herd from fecal matter from other states? Does that spark a concern?

Economically and behaviorally, it is important to know this. I don't think regulations will stop the spread of CWD, but knowing it can be transferred this way may slow it.









Edited by Duck Buster (01/30/18 03:40 PM)

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#7059247 - 01/30/18 07:09 PM Re: Chronic Wasting Disease A Time Bomb For Agriculture? [Re: okietex]
Sneaky Online   content
The "Grouch"

Registered: 10/22/12
Posts: 18422
Loc: Winters
Originally Posted By: okietex
Can I get cliff notes?


The sky is falling.
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#7059393 - 01/30/18 08:28 PM Re: Chronic Wasting Disease A Time Bomb For Agriculture? [Re: flounder]
maximus_flavius Online   content
Tracker

Registered: 04/24/13
Posts: 820
TL;DR

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#7059463 - 01/30/18 08:56 PM Re: Chronic Wasting Disease A Time Bomb For Agriculture? [Re: Duck Buster]
therancher Online   content
THF Trophy Hunter

Registered: 07/09/13
Posts: 6377
Loc: Mountain Home, Uvalde, and Big...
Originally Posted By: Duck Buster
Why are you surprised it came from a pork farm journal? They care about their crops, and they're becoming informed. Pork are fed grains, so it makes sense.

back

I find it interesting they are conducting this research. When I was working for TPWD this was a question I got regularly. It is a question people ask...how long does it stay infectious in nature, and can their animals get it if it is on a plant or on the ground? Its not that far of a step to ask if a plant can absorb and then spread the disease after being eaten, because of how long it persists in nature.

Zoonotic diseases can be a real threat. Better to know this now, than when its too late. Do you really want alfalfa or other grains to come from Montana or Idaho or Colorado or midwest with high rates of CWD, knowing that plants can be a carrier for cwd, or there is fecal matter from an animal with CWD, then feed it to your livestock? Or it being fed in feedlots to the beef you buy at the store?

Or don't even discuss it going from cervids to hogs or beef or goats- what about CWD fecal matter on deer corn that you put in your feeder, and infect your deer herd from fecal matter from other states? Does that spark a concern?

Economically and behaviorally, it is important to know this. I don't think regulations will stop the spread of CWD, but knowing it can be transferred this way may slow it.









They can’t MAKE it infect most cervids even implanting the prions directly into their brains. And you want me to believe it’s an issue to be concerned with in swine?? Lol

You’d have to be ignorant or short bussed to believe that.


Edited by therancher (01/30/18 08:57 PM)
_________________________
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#7059607 - 01/30/18 11:12 PM Re: Chronic Wasting Disease A Time Bomb For Agriculture? [Re: flounder]
kyle1974 Offline


Registered: 05/06/09
Posts: 2093
hey mods, just curious... how many CWD panic attack threads does any one member get?


asking for a friend.

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#7059641 - 01/31/18 12:42 AM Re: Chronic Wasting Disease A Time Bomb For Agriculture? [Re: flounder]
2Beez Offline
Chihuahua

Registered: 07/17/15
Posts: 9124
Loc: Lake Texoma, TX
Careful...
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#7059796 - 01/31/18 07:41 AM Re: Chronic Wasting Disease A Time Bomb For Agriculture? [Re: Duck Buster]
Pitchfork Predator Online   content
THF Celebrity

Registered: 01/25/13
Posts: 13471
Loc: Murphy, TX Dickens county
Originally Posted By: Duck Buster
Why are you surprised it came from a pork farm journal? They care about their crops, and they're becoming informed. Pork are fed grains, so it makes sense.

back

I find it interesting they are conducting this research. When I was working for TPWD this was a question I got regularly. It is a question people ask...how long does it stay infectious in nature, and can their animals get it if it is on a plant or on the ground? Its not that far of a step to ask if a plant can absorb and then spread the disease after being eaten, because of how long it persists in nature.

Zoonotic diseases can be a real threat. Better to know this now, than when its too late. Do you really want alfalfa or other grains to come from Montana or Idaho or Colorado or midwest with high rates of CWD, knowing that plants can be a carrier for cwd, or there is fecal matter from an animal with CWD, then feed it to your livestock? Or it being fed in feedlots to the beef you buy at the store?

Or don't even discuss it going from cervids to hogs or beef or goats- what about CWD fecal matter on deer corn that you put in your feeder, and infect your deer herd from fecal matter from other states? Does that spark a concern?

Economically and behaviorally, it is important to know this. I don't think regulations will stop the spread of CWD, but knowing it can be transferred this way may slow it.









No concern whatsoever and I don't want my tax dollars going toward this research.
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www.insured-wealth.com
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#7059807 - 01/31/18 07:49 AM Re: Chronic Wasting Disease A Time Bomb For Agriculture? [Re: okietex]
BOBO the Clown Offline
decoy

Registered: 04/19/07
Posts: 43129
Loc: Metroplex
Originally Posted By: okietex
Can I get cliff notes?


Flounder says become a vegan, but don’t eat alfalfa sprouts may have deer and elk pee and poop on it

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#7060394 - 01/31/18 01:43 PM Re: Chronic Wasting Disease A Time Bomb For Agriculture? [Re: therancher]
Duck Buster Offline
Tracker

Registered: 01/09/12
Posts: 691
Loc: Yukon Delta, Alaska
Originally Posted By: therancher
Originally Posted By: Duck Buster
Why are you surprised it came from a pork farm journal? They care about their crops, and they're becoming informed. Pork are fed grains, so it makes sense.

back

I find it interesting they are conducting this research. When I was working for TPWD this was a question I got regularly. It is a question people ask...how long does it stay infectious in nature, and can their animals get it if it is on a plant or on the ground? Its not that far of a step to ask if a plant can absorb and then spread the disease after being eaten, because of how long it persists in nature.

Zoonotic diseases can be a real threat. Better to know this now, than when its too late. Do you really want alfalfa or other grains to come from Montana or Idaho or Colorado or midwest with high rates of CWD, knowing that plants can be a carrier for cwd, or there is fecal matter from an animal with CWD, then feed it to your livestock? Or it being fed in feedlots to the beef you buy at the store?

Or don't even discuss it going from cervids to hogs or beef or goats- what about CWD fecal matter on deer corn that you put in your feeder, and infect your deer herd from fecal matter from other states? Does that spark a concern?

Economically and behaviorally, it is important to know this. I don't think regulations will stop the spread of CWD, but knowing it can be transferred this way may slow it.




They can’t MAKE it infect most cervids even implanting the prions directly into their brains. And you want me to believe it’s an issue to be concerned with in swine?? Lol

You’d have to be ignorant or short bussed to believe that.


from the article:
"However, in laboratory conditions, CWD has been reproduced experimentally in cattle and swine, and research studies continue to examine crossover possibilities."

So...it can be developed in swine. I'm not saying it will cross over, i'm just saying there could be a chance......so, am I ignorant, or do I ride the short bus because I read the article?

Just because it can be produced experimentally doesn't mean it will occur naturally...but it means there is a probability that it can.

I don't know about your source for it not being able to MAKE it infect cervids with prions directly into the brain, but i'd be willing to give it a read if you'd be willing to share.

What i found with a quick google search, and directed to this website:
http://cwd-info.org/cwd-overview/

"Susceptibility of other cervids to CWD is not known. Cattle appear to be resistant to natural infection; to date, only three of 13 cattle have become infected with the CWD agent following experimental intracerebral inoculation, although this and other experimental studies begun in 1997 are not yet completed. Susceptibility to the CWD agent has been documented in sheep through intracerebral inoculation, but no studies have been conducted to show that CWD can be transmitted to sheep through oral exposure or other vectors "

So chances are low, but my calculations (3/13 * 100)= 23% of cattle were infected with prions to the brain, and it is susceptible in sheep via prions to the brain.

I'm just saying what I've seen. Keep too many animals in too close a proximity eating and drinking from the same sources, diseases pop up sooner or later. Its the natural way of reducing densities.

I'm a skeptic too about whether or not fecal matter on vegetation contain enough prions, or vegetation itself can spread the disease. And I personally don't have the knowledge, desire, or ability to study it myself. But if it does, it would be nice to know, And enough people that care about their livestock, game animals, etc spoke up about wanting to know and are obviously concerned about this, or funding likely would not have been granted.




Edited by Duck Buster (01/31/18 02:15 PM)

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#7060560 - 01/31/18 03:15 PM Re: Chronic Wasting Disease A Time Bomb For Agriculture? [Re: Duck Buster]
therancher Online   content
THF Trophy Hunter

Registered: 07/09/13
Posts: 6377
Loc: Mountain Home, Uvalde, and Big...
My source was TPWD. They cited the research in a public forum I attended. Axis, fallow and sika were inoculated and only sika developed the disease. Although there’s never been a natural infection found in sika, the state in its infinite wisdom have place them under cwd protocol just like deer and elk.

And justifying your opinion by saying the funding wouldn’t have been approved if a large part of the industry wasn’t concerned is weak at best.

I don’t know anyone in the industry who’s as concerned about cwd as much as they are a govt agency applying their collective ignorance to solve a non issue.
_________________________
"I cant wait to see if he plays this week, and if he does if he can actually break 50 percent completion ratio. Haha or maybe even throw for 200 yards. Possibly break a QB rating of 75." - Texas Tatonka
www.bigironranchadventures.com

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