*Editor’s Note* – The following is an article from The Outdoorsman, Bulletin #44 for June 2011. It is republished here by permission of the author.
Read the Truth about Hydatid Disease in Humans
By George Dovel
On Page 3 of the January 2005 Outdoorsman, I described how Hydatid disease in tapeworm eggs spread by wolves causes cysts to form in the internal organs of moose, elk, caribou, deer and humans. I published the following photo of two Hydatid cysts in moose lungs and wrote that in Alaska, more than 300 cases of Hydatid disease in humans had been reported during the 35 years from 1955-1990.
That article described how both Alaska and Canadian F&G agencies publish warnings urging trappers and hunters to wear rubber gloves and protective clothing when skinning or handling a wolf carcass. They also warn dog owners not to let their dogs eat internal organs, to prevent ingesting the cysts (which contain thousands of larvae) and the dog then becomes a host for the tapeworm.
Bangs Lied About Impact of Wolf Parasites
The article pointed out that concerns from APHIS and CDC about the spread of this disease resulting from the importation of wild canines from areas where it exists have been ignored by wolf biologists. It also referred to Pg. 1-20 of the 1993 Draft Wolf Environmental Impact Statement to Congress that stated, “Wolf recovery is unlikely to have any measurable impact on disease or parasite transmission.”
A dozen years earlier, Ed Bangs, who either wrote or approved everything in that Wolf EIS, authored an FWS research report in which he similarly denied the impact of wolf predation on an Alaska moose population.
He knew that Alaska and Canadian wildlife agencies were issuing warnings about the spread of hydatid disease by wolves yet he ignored it. He also ignored expert testimony from several people, including Will Graves and world-renowned parasitologist Dr. Delane Kritsky about the spread of Hydatid and other diseases by wolves, when he published the same lie again in the final Wolf EIS in 1994.
Thousands of Worms per Wolf Hidden From Public
Nearly a year after that issue was circulated, Idaho and Montana State F&G agencies began to quietly count and record the number of hydatid worms found in the lower intestine of dead wolves from each state. William Foreyt, a Wash. State University parasitologist, and veterinarians Mark Drew from Idaho and Mark Atkinson and Deborah McCauley from Montana, conducted the study.
The 10-page September 2006 (FY 2006) IDFG Wildlife Health Laboratory (WHL) Report included only the following sentence about IDFG’s discovery of hydatid disease in mule deer, elk and a mountain goat during necropsy (post mortem) examinations of various species:
“In addition, 1 mountain goat and several mule deer and elk were found to have hydatid cysts in the lungs (Echinococcus granulosa), likely with wolves as the definitive host of this previously unrecognized parasite in the state.”
The report stated: “Wolf necropsies indicated the presence of lice,” but made no mention of their finding E. granulosus eggs in the wolf feces or their finding tens of thousands of adult worms in many wolf intestines. It also mentioned examining fecal samples from 10 live wolves that were captured, but again there was no mention of the existence of the eggs that resulted in the deer, elk and a goat being infected with hydatid disease.
In other words, the inference was that Idaho big game animals were already infected with hydatid disease caused by other predators that were already here before the “nonessential experimental” wolves were brought in.
Annual Reports Did Not “Connect the Dots”
But whether or not that was the main reason for not reporting the massive spread of hydatid disease by wolves, the deception continued. The FY 2007 WHL Report stated: “Wolf necropsies indicated the continued presence of lice (Trichodectes canis) and tape worm (Echinococcus), previously detected last year in Idaho. Wolves are most likely the definitive host of this previously unrecognized parasite in the state”. (emphasis added)
The FY 2008 WHL Report said exactly the same thing but neither report mentioned the hydatid cysts found in the mountain goat and in deer and elk beginning in 2006. All three of these reports were signed by IDFG officials, including two veterinarians, and sent by F&G Directors to the feds, but massive infestations were kept from the public until Tom Remington discovered the researchers’ final report in the Journal of Wildlife Diseases on Dec. 13, 2009.
When the Dec. 2009 Outdoorsman published the truth about the cover-up of the wolves’ spread of disease in Idaho and Montana, plus facts about hydatid disease and wolves by Dr. Valerius Geist, the tapeworm counters published a few facts mixed with half-truths and even several absurd lies to try to discredit our information.
First Absurd Lie Published by Mainstream Media
In newspaper articles in both Idaho and Montana, the study’s lead author, Parasitologist Foreyt, claimed, “You’d have to eat the eggs in the feces, not just inhale them, in order for the tapeworm to take root (in humans).” If that were true, how did tens of thousands of deer and elk get the disease?
If you believe they caught it from eating wolf feces, please don’t read any further. This is a perfect example of the “dumbing down of America” that explains why most people no longer question the agenda-driven “reporting” they read in their newspaper or watch on TV.
Not even one letter-to-the-editor was printed in the Idaho or Montana newspapers questioning this so-called “expert’s” absurd claim that humans have to eat wolf feces to become infected. This apparently prompted Panhandle Region Supervisor Chip Corsi to publish the following directive to Regional IDFG employees:
“Based on Mark’s assessments (attached), human health risk is quite low, provided you avoid consuming things like canid [canine] feces and uncooked organs; and I think suggests Dovel’s interpretation is more than a bit sensationalized.”
Drew’s Documents only Address Eggs Still in Feces
Corsi was referencing several documents prepared by tapeworm counter/veterinarian Mark Drew, which were promptly cited by the urban media as additional information from a so-called “expert” to denounce the facts published in The Outdoorsman (see “Who’s afraid of the big bad tapeworm” by environmental activist Rocky Barker in the Jan. 28, 2010 Idaho Statesman).
Barker copied the propaganda in Drew’s papers, which apparently attempted to provide a flimsy alibi for the States’ failure to warn its citizens of the billions of hydatid tapeworm eggs it had allowed to be deposited over the landscape where citizens live, work and recreate. In response to the question, “How do I prevent getting infected with this parasite if I am a hunter, trapper or outdoor enthusiast?” Drew wrote, “The potential for human exposure to E. granulosus eggs in wolf feces or fecal contaminated hides is relatively low.”
He suggested wearing latex or rubber gloves when skinning a wolf or coyote or when handling feces from wolves or dogs, washing your hands after handling feces, and said all wild game meat should be butchered as soon as possible after killing. He warned that all wild game should be cooked thoroughly and cautioned that uncooked meat or organs of deer, elk, moose, etc. should not be fed to dogs.
But landowners who have spent years attempting to control weeds, parasites and diseases that are transported over distances of a mile or more by wind, water, birds animals, beetles, flies and other insects, expressed outrage that Drew only addressed danger to humans while the eggs are still in the feces. He made no mention of the fact that eating unwashed wild foods such as asparagus, mushrooms and berries or drinking water that is not in the immediate vicinity of the feces are still sources of infection in people.
The Second Lie – “Sylvatic Infection Is Not Severe”
Drew implied such precautions are really not that important with his false claim: “The human infection with the northern biotype of E. granulosus is relatively benign.” In a Jan. 16, 2010 Lewiston Tribune article that mentioned the Dec. 2009 Outdoorsman and Dr. Geist’s comments, Foreyt added, “The news media have overblown this – that it is going to affect people and animals and it really is not. If this wildlife strain ever does affect people, they usually don’t produce any serious problems.” Drew added that people diagnosed with the disease can be treated with medication.
These dangerous myths, promoted for about half a century by Parasitologist Robert Rausch, were based on treatment of elderly Eskimos who had no symptoms but whose hydatid cysts were accidentally discovered during chest X-Rays to detect early TB. Most of those Eskimos, with no symptoms of disease, were treated without surgery.
But more recently, university medical teams from Winnipeg and Edmonton pointed out the failure of the older reviews cited by Rausch to include patients who were actually suffering from Sylvatic Hydatid disease – rather than only those fortunate enough to have survived supposed cyst rupture or calcification in their lungs.
With an impressive number of case histories from 1987-97 and 1991-2001, these Canadian doctors found no difference between either the severity or the complex treatment of sylvatic vs. domestic versions of the disease. (see Pages 4 & 5 of the Jan. 2010 Outdoorsman).
Instead of using these published reviews of actual medical cases involving the sylvatic tapeworm, the tapeworm counters chose to use the flawed reviews from the 1950s and 1960s as their source of information on the impact of the Northern wild Hydatid strain on humans. In fact 30% of their published reference data was written by Robert Rausch who also verified the identity of the tapeworms for them.
If medical doctors ignored facts to resurrect flawed theories the way many wildlife officials are doing, it would doubtless result in a much shorter lifespan. The following disputed claims published by the tapeworm counters in the October 2009 issue of the Journal of Wildlife Diseases are designed to make citizens and their elected officials believe there is not a significant health hazard from the tapeworms:
“The human infection produced by the northern biotype is relatively benign”; “Because the northern biotype has low pathogenicity in humans, the human health hazard potential is not as important as the domestic biotype, which has more serious ramifications in humans”; “In humans, the cysts are primarily in the lungs, and the cysts often have poorly developed cyst walls, few or no protoscoleces, and often the infections resolve via rupture and expulsion.” (emphasis added)
Few Treated Hydatid Disease Cases Are Reported
Even in places where reporting treatment of human Hydatid disease is required by law, only a small percentage of the humans treated are actually reported. For example a five-year study of hospital records in just the Australian State of New South Wales and the Australian Capital Territory from 1987-1992, found that 321 separate patients were treated for hydatid disease but only 17* were reported! (* despite a mandatory reporting requirement until 2001)
In the U.S. and Canada, anyone who claims to know how many people were treated for the disease in recent years – much less claiming to know the ratio of lung to liver cysts in untreated patients – is not telling the truth. A recent composite of reported cases showed liver-63%, lung-25%, muscle-5%, bone-3%, kidney-2%, brain-1% and spleen-1%.
Recent Sylvatic Hydatid Disease in Alaska Humans
In 1999 in Alaska, only two cases of hydatid disease were reported, both apparently resulting from the Northern Sylvatic biotype, yet both were described as “life threatening”. They were discussed in detail in the Jan. 2010 Outdoorsman, and are briefly re-mentioned here.
The first patient, a 51-year-old Caucasian woman with no symptoms, was misdiagnosed as having a simple liver cyst that was felt during a routine physical exam and confirmed with ultrasound. She was sent home without treatment but three months later, she suddenly became sick and died three days later, reportedly from a leaking hydatid cyst that was never diagnosed while she was alive.
The second 1999 Alaska patient, a 17-year-old Native woman, experienced an extended period of painful illness, high fever and surgical treatment of two sylvatic* hydatid liver cysts. After a 30-day hospital stay, including transfer to a larger hospital for observation, she took two daily 400 mg doses of albendazole (wormer) for another 12 months and was then pronounced free of symptoms.
(* The sylvatic infection was confirmed by subsequent genetic testing of the cyst material in an Australian facility)
In Feb. 2010, after I published so many case histories of patients treated in Canadian hospitals for serious sylvatic hydatid cyst infections in the Jan. 2010 Outdoorsman, the barrage of propaganda in the media ceased. But there was no attempt by the tapeworm counters, state F&G officials, several elected officials or the media to correct any of the widespread misinformation.
New F&G Excuse to Hide the Truth
Following my publication a month ago of the Outdoorsman article by the lady whose hydatid cyst was not diagnosed for two years despite life-threatening complications, at least one IDFG official is now trying to claim there is very little danger of human infection because heat and low humidity kill the eggs once they are released from the pile of wolf scat. But that appears to be simply another example of trying to invent an excuse to cover up the potential of human infection over large areas in the two states.
Page 178 of the 2008 OIE (World Organisation for Animal Health) Manual stipulates a minimum water temperature of 185 degrees F to kill E. granulosus eggs, or a minimum dry temperature of 158 degrees F for at least 12 hours. It says that chemicals will not kill all of the eggs and decontamination of laboratories requires a constant 86 degree F temperature with 40% or less relative humidity for at least 48 hours.
Because of lower morning temperatures and higher humidity, no place in Idaho or Montana where such records are recorded ever meets those specifications. With the extreme wolf densities in many areas resulting in a 90% infection rate and up to tens of thousands of tapeworms in each wolf, a continued supply of infective eggs is assured.
Factual Information from Bona Fide Experts
Hydatid disease was recently declared eradicated in Tasmania because strict control of the sole definitive host (domestic dogs) and the intermediate host (sheep) was finally achieved after 40 years of effort. But bona fide experts in mainland Australia say it can never be eradicated there because a sylvatic (wild) strain of infection continues, with wild dogs and dingoes as the definitive host blanketing the landscape with eggs – and their wild prey, kangaroos and wallabies, eating the eggs and developing cysts, which continues to perpetuate the disease cycle.
According to the 2007 Primefact 475 publication titled, Hydatids – you, too, can be affected, “This makes the eradication of the tapeworm impossible, and the wildlife cycle of increasing importance in human infections, especially in areas bordering National Parks where control of wild dogs/dingoes is difficult, and in suburban areas fringing regional towns.”
The updated Australian publication also explains, “At one time it was thought that the strains in the domestic life cycle and the sylvatic life cycle were distinct, but it now appears that they are genetically the same.” These experts, who have managed to finally eradicate hydatid disease in both Tasmania and New Zealand during the last decade, realize that without the ability to eradicate the sylvatic disease in the wild canids, their effort to eradicate it in mainland sheep and dogs can never be successful.
Unfortunately, the hydatid disease problems described in the Australian mainland parallel the situation in Idaho and Montana. That is probably why Idaho’s world-renowned parasitologist, Dr. DeLane Kritsky, wrote, “The only way that the parasite will be eliminated from our area is elimination of the wolf” (see page 16 of Feb-April 2010 Outdoorsman).
Australia Published Facts – Not Unsupported Theories
Because the early reviews of hydatid disease in Alaska and Canada dealt with the sylvatic (wild) strain, the lung cysts they assumed had ruptured at some earlier time without ill effects (in the elderly Eskimos they X-Rayed) may have simply died. The very same thing happens in some cysts in intermediate hosts from the dog-sheep strain in Australia, but unlike their early Alaska counterparts they reported facts – not assumptions – as follows:
“As the [intermediate host] animal gets older, some of the cysts die and form scars. Often, dead cysts become filled with caseous (cheesy) material, or they become calcified, but the outer laminated layers can still be distinguished microscopically.”
Then instead of speculating this phenomenon meant that the Australian dog-sheep strain of hydatid disease is also “more benign” and has “low pathogenicity” in humans, as Rausch has done with the wolf-moose strain, the Australians reported the facts:
“Hydatids in humans is a serious disease…the formation of cysts in the body is always dangerous and their surgical removal is never straightforward. A major concern during surgery to remove cysts is that brood capsules can float free within the cyst. If a cyst ruptures, the brood capsules can spread through the body and secondary cysts can grow wherever they come to rest. This contributes to the high level of recurrence (37.5% of patients). Deaths from hydatid disease still occur both before and after surgery.”
Incomplete Information Puts Citizens at Risk
Unfortunately for residents of Idaho and Montana who live, work or recreate in the outdoors beyond the confines of the cities, their state government officials are pretending the only significant risk to them of catching hydatid disease is either from handling wolf feces or wolf carcasses, or not properly supervising what their dog eats or rolls in. For those who fail to monitor what their dogs and other pets eat, they are told to wash their hands after handling the animals and worm them with Praziquantel every six weeks.
Although six weeks is reportedly about how long it takes for most E. granulosus tapeworms to reach maturity in the intestine of a dog or wolf, the pet owners are not told that the wormer may not last beyond the initial worming day. Also it does not kill any eggs that may exist in the gravid section of the tapeworms, or those that exist in the intestine or in the animal’s coat, and it is these eggs which cause the disease in humans and other intermediate hosts.
Dog owners are not told to stake their dog on bare ground when worming and for a significant period after worming – and then to pour kerosene on that ground and burn it to kill the eggs. Nor are they warned that allowing access to lawns, vegetable gardens, water sources, etc. to dogs, raccoons and other animals with the eggs on their coats will provide another source of contamination for humans even in their homes (see warnings from Dr. Geist).
Otter’s Promise to Kill Wolves Nets Poor Results
Despite Idaho Gov. Otter’s promise to significantly reduce the number of wolves impacting big game since conditional management of wolves was returned on May 5th, only five Lolo Zone wolves have been killed by a USDA Wildlife Services helicopter gunner team, a sixth was shot by an IDFG officer and none were killed by the designated outfitters and their guides. A seventh wolf was shot in Elk City by local Sheriff’s Deputies (see photo).
State Agencies Protect Wolves – Not Citizens
Despite expert testimony warning MT Legislators of the serious impact hydatid disease spread by wolves will have on humans, opposition by MTFWP and other state agencies criticizing the cost defeated legislation to protect Montana citizens. When similar legislation (HB 343) passed overwhelmingly in Idaho, Gov. Otter’s refusal to declare a wolf disaster plus his failure to use the necessary tools to halt the spread of disease has had the same result.
Instead of protecting the health and welfare of private citizens and their constitutional right to enjoy their livestock, pets and other private property, the governors and their bureaucratic agencies continue to protect wolves and the diseases they spread. Pretending that sport hunting and trapping seasons advocated by biologists will resolve the problem is just another excuse to implement their destructive agenda with less public resistance.
Citizens Forced to Protect Themselves from Disease
Private citizens, and county governments that realize what is taking place are being forced to educate and protect themselves from the disaster that is being forced on them by both federal and state bureaucrats. The following photographs may help you understand the parasite that is infecting humans, and the long-term massive changes that take place once its eggs enter the human body:

Except in snow or extreme cold which preserves the eggs, wolf feces are disturbed by assorted creatures, including humans riding horses or ATVs on the trails. Lightweight and invisible to the naked eye, they are soon spread across the landscape settling on both vegetation and water* where some are ingested by the intermediate hosts.
(* Surveys indicate that contamination of water may be the second highest source of human infection in some areas.)
Danger! – Do Not Puncture Cysts
Once the eggs are ingested by humans the stomach juices dissolve the protective membrane (“eggshell”) and the tiny hooked embryos “hatch” and soon bore through the intestinal wall into veins or lymphatics. If in the veins, they encounter the liver first where some began to grow into a cyst, but others travel on to the lungs or other organs.
Development of the cyst, including its size and rate of growth is dependent upon the type and age of the host and many other factors including the organ it is in. One of the 17 Northern sylvatic liver cysts reported by the Winnipeg hospital reached a diameter of 10-1/4 inches in an 18-year-old woman before it became life-threatening.
A single fertile cyst may contain millions of “grains” of “hydatid sand” which are actually juvenile worms waiting for a canine to eat them so they can attach to its gut and grow to adults. But if the cyst is accidentally punctured whether by a doctor, someone examining a dead body, or a butcher cutting up the meat, the cyst fluid may spurt into their eye or mouth and create new cysts without the stomach or eggs being involved.
Hundreds of mature E. granulosus tapeworms, averaging about 1/8? in length, attached to the lower intestine of a dog.
For doctors and others who want accurate, truthful medical facts concerning hydatid disease, the U.S. Military has provided the latest version of the 1,700-page medical journal, “The Imaging of Tropical Diseases,” free at: http://tmcr.usuhs.mil/tmcr/chapter3/intro.htm Then click on “next page” to continue. WARNING!! Do not accept as factual any statement from any state Wildlife Vet or F&G official or other State bureaucrat (Ag., Health & Welfare).