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PAK’s National is a new arrival on the pest management scene in Australia but its three Directors, two from Victoria and one from Sydney, have long been involved in pest animal management. Peter Humble and Kevin Chandler have been involved in a wide range of field-based control work against rabbits and foxes in Victoria for well over a decade. Alec Walker, from Sydney, has spent most of his life in the area of developing and marketing vertebrate pest control products. PAK’s National, then, combines both experience ‘at the coal face’ and in the area of product development and marketing.
Hydatid disease is a zoonotic disease caused by the intermediate stage of the dog tapewormEchinococcus granulosus. It causes cyst formation in internal tissues such as the liver, lungs and brain of grazing animals and people.
The hydatid tapeworm lifecycle involves a definitive host (dog or dingo), which hosts the adult tapeworm in the gut, and intermediate hosts (sheep, goats, cattle, pigs, kangaroos and wallabies), which are host to the watery cystic stage - most commonly in the liver and lungs.
Accidental ingestion of tapeworm eggs by people can result in multiple cysts occurring in internal tissues. Hydatid disease is a serious infection in people and may be fatal in a small number of cases. In Queensland, there is an average of 10 cases of hydatid disease reported each year.
|Where the disease occurs||
Hydatid disease occurs worldwide. In Queensland it is most prevalent in rural areas where there is a close association between dogs and dingos with cattle, sheep, goats, pigs, kangaroos and wallabies. The disease can occur in any area where dogs consume raw offal.
|The disease in animals||
Dogs are host to adult tapeworms; however, they do not display any signs of infestation. The adult worm measures 6-15mm and diagnosis of infestation relies on microscopic examination of the faeces to identify tapeworm eggs. Dogs become infected by eating cysts (intermediate tapeworm stage) in uncooked offal from infected sheep, cattle, pigs and wildlife.
Cattle, sheep, pigs and wildlife
There are usually no obvious signs of disease in these animals, even when cysts are detected at slaughter.
There is no treatment for hydatid cysts in grazing animals. If cysts are present at slaughter, lungs, livers and hearts are condemned.
|How the disease spreads||
Hydatid eggs are dispersed in the environment via the faeces of infected dogs. Dogs can host several thousand adult tapeworms in their intestine. The sticky eggs in their faeces can also adhere to the dogs' coats.Hydatid disease (cyst formation) occurs as a result of ingesting the microscopic eggs. Grazing animals are infected by eating contaminated pasture. People are infected when they accidentally ingest the eggs excreted in dog faeces. This can occur:
People are at increased risk of infection if they live in grazing areas where dogs are used to herd cattle and sheep.
Dogs and dingos consuming the cysts within the offal of livestock or wildlife completes the lifecycle by creating a new generation of adult worms.
Person-to-person and livestock-to-person transmission do not occur.
|Control of the disease in animals||
Control involves breaking the tapeworm lifecycle.You can do this by:
It is especially important for dogs located in rural areas or those that may have contact with wildlife and feral animals to receive regular treatment with praziquantel. Praziquantel kills the adult hydatid tapeworm and should be administered at regular intervals.
Regular worming of dogs for tapeworm will also control the tapeworms responsible for sheep measles (Taenia ovis) and bladder worm or false hydatids (Taenia hydatigena). Monthly worming can conveniently control all three parasites.
Ask your local veterinarian about effective tapeworm control.
|Can people get the disease?||
Symptoms in people vary according to the number, size and location of cysts within the body. Hydatid disease can cause serious illness and death.
|Treatments for people||
Treatment involves the surgical removal of cysts.
|Prevention in people||
To prevent hydatid disease in people:
more information available from :
Australian Feral Pest Management
Available Australia Wide
Call: 1300 FERAL PEST
Australian Wildlife & Feral Management PH 0413602155