|
|
| (8 intermediate revisions by 2 users not shown) |
| Line 1: |
Line 1: |
| − | =Pinworm - ''[[Oxyuris equi]]''= | + | =Pinworm - [[Oxyuris equi]]= |
| | | | |
| | ==Introduction== | | ==Introduction== |
| | | | |
| − | ''Oxyuris equi'', the equine pinworm, is a well known equine parasite with a worldwide distribution. They are commonly called pinworm because of the sharp, tapering tails of the females measuring up to 15 cm long. Adults primarily live in the right dorsal colon but may inhabit the proximal sections of the large intestine if worm burden is high. The characteristic feature of this parasite is that gravid female worms migrate to the anus to deposit their eggs in sticky clumps seen grossly as a yellowish white or light orange gelatinous streak on the skin of the perianal region. Although some mucosal damage caused by the feeding habit of L4 were reported, a more important effect of this parasite is the perianal irritation and anal pruritis caused by the adult females during the egg laying process.
| + | This is an endoparasite, but the main damage is due to anal irritation and stress from that irritation. |
| − | Although a well know equine parasite, ''O. equi'' received little attention because it was relatively non-pathogenic and could be controlled satisfactorily by routine anthelmintic therapy. However, in recent years, it appeared to exhibit a dramatic change in its biology and anthelmintic susceptibility. This once rare parasite seems to be on the increase in donkeys in the UK.
| + | |
| | + | It is rarely seen in donkeys in the UK. |
| | | | |
| | ==Diagnosis== | | ==Diagnosis== |
| − |
| |
| − | This is often based on clinical signs and the recovery of eggs from the perianal skin. Sometimes adult worms can be seen passed in the faeces.
| |
| | | | |
| | ===Clinical signs=== | | ===Clinical signs=== |
| | | | |
| − | '''Tail-rubbing''' accompanied by broken hair shafts, or excoriated skin on the rump or base of the tail is a frequent diagnostic feature. Donkeys do not, however, appear to demonstrate this behaviour as frequently as horses. The intense itching often leads to restlessness and impaired feeding, causing some loss of condition. | + | '''Tail rubbing''' is a frequent diagnostic feature. |
| | | | |
| | ===Laboratory tests=== | | ===Laboratory tests=== |
| | | | |
| − | Unlike other nematode parasites of donkeys and horses, pinworm eggs are rarely observed in faecal samples due to the unique egg-laying behaviour of the females. However, ''O. equi'' eggs can be collected by pressing clear sticky tape onto the perianal skin and applying the tape to a glass slide for direct microscopic observation.
| + | The eggs may not be found in the faeces, but can be recovered from the perineum using sticky tape. |
| | | | |
| | ==Treatment== | | ==Treatment== |
| | | | |
| − | * Routine anthelmintic treatment and symptomatic care - see [[Strongyles - Small - Donkey#Treatment|treatment of strongyles]] | + | * Routine anthelmintic treatment and symptomatic care - see [[Strongyles - Donkey#Treatment|treatment of strongyles]] |
| − | | |
| − | Anthelmitics that have demonstrated efficacy against larval and adult ''O. equi'' in horses include ivermectin, moxidectin, fenbendazole and mebendazole. Pyrantel has demonstrated efficacy against adult stages only.
| |
| − | Recently there have been a number of unpublished and some published reports of reduced anthelmintic efficacy against O. equi in horses. The Donkey Sanctuary has also experienced a lack of response to treatment with both ivermectin and pyrantel in donkeys. Therefore, this must be taken into consideration while treating.
| |
| − | In addition to anthelmintic treatment, where animals are showing clinical signs such as clumps of eggs in the perineum, it is advisable to clean up the perianal region and underside of the tail using disposable cloth to remove egg masses.
| |
| | | | |
| | ==Control== | | ==Control== |
| | | | |
| − | Apart from a routine [[Anthelmintic Drugs|anthelmintic]] programme the practice of good hygiene to reduce environmental contamination by infective eggs is very important.
| + | * Routine [[Anthelmintic Drugs|anthelmintic]] programme |
| − | The most likely sources of infection and transmission include feeding areas, water dispensers, troughs, stall litter and any communally used rubbing posts. Therefore, any comprehensive approach to combating ''O. equi'' infections must include serious efforts to keep these items and areas as clean as possible. This could be achieved by periodic steam-cleaning and use of strong disinfectants after removal of any bedding.
| + | * Responds well to most of the common [[Anthelmintic Drugs|anthelmintic]] compounds |
| − | | + | * Periodic steam-cleaning of stables |
| − | ==Literature Search==
| |
| − | [[File:CABI logo.jpg|left|90px]] | |
| − | | |
| − | | |
| − | Use these links to find recent scientific publications via CAB Abstracts (log in required unless accessing from a subscribing organisation).
| |
| − | <br><br><br>
| |
| − | [http://www.cabdirect.org/search.html?q=%28title%3A%28pinworm%29+OR+title%3A%28pin+worm%29+OR+title%3A%28oxyur*%29%29+AND+%28od%3A%28donkeys%29+OR+title%3A%28donkey%29+OR+ab%3A%28donkey%29%29 Pinworm in donkeys publications]
| |
| | | | |
| | ==References== | | ==References== |
