Skin fungal disease in sheep treatment and prevention

Skin fungal disease in sheep treatment and prevention Footrot is caused by the coexistence of two gram-negative, anaerobic bacteria, Fusobacterium necroph nodosus from a flock.

Footrot is a contagious disease of cattle, sheep, and goats, and possibly other ruminants, although the clinical severity in these animals is much less than in sheep. It is caused by the simultaneous actions of Fusobacterium necrophorum and Dichelobacter nodosus (earlier known as Bacteroides nodosus) and characterized by a chronic bacterial infection that is confined to the epidermal tissues of th

e interdigital skin and horn of the hoof. Besides, the demolition of the hard keratin coating on the hoof is one of the main characteristics and results in lameness in most cases. Footrot is distinguished by the smell of the hoof epidermical tissues, inflammatory exudates, and necrosis.1–4

Contagious ovine footrot is the most limiting disease and it was initially described in 1869. It is a costly disease to the sheep industry due to the cost of treatment and labor, drugs and equipment, decreased flock productivity, and losses from sales of breeding stock. All these results in significant economic hardship for animal producers worldwide.5,6 In sheep, 90% of lameness cases are caused by footrot (Dichelobacter nodosus).7 The virulent and benign are the two forms of the disease that are well-studied and described. The most economically virulent form of the disease presents a great burden on the development and welfare of livestock.6,8,9

The clinical signs associated with ovine footrot depend on factors such as the virulence of the organism, the climatic environment, the health or trauma to the interdigital skin, and several host factors. Lameness is typically the main sign of a diseased sheep, though sheep with an initial infection may not reveal lameness.2 The diverse and complex transmission of footrot involves the use of multiple etiologic agents, frequently complicated or reinforced by the environmental, host, and genetic factors, stock rate, and nutritional efficacy.1,4 Induction and development of the disease procedures are carried out by Fusobacterium necrophorum, while Dichelobacter nodosus is the transmission agent.8,10 Moreover, overgrown feet, recurrent or high rainfall for numerous weeks and low temperature typically under 10°C are the major factors for the transmission and most outbreaks of footrot.2,11

According to Raadsma and Egerton, wet Season raises footrot vulnerability since it affects the physical structure of the hoof making it more susceptible to the disease.8 Despite the organism’s biology that suggested D. nodosus needs no oxygen for growth, the pathogen can remain exposed to air for up to 10 days and can be transmitted through soil contact, indicating that the stocking rate of new animals can dramatically decrease the speed of D. Also, studies have demonstrated that footrot management is difficult due to the capacity of the pathogen to survive in the open air and transmit via contact with the soil.1,3,12

Footrot should be differentially diagnosed from other hoof problems that cause lameness. Hoof separation, white line lesions, foot abscesses, sole ulcerations and abscesses, hoof injuries due to foreign bodies, granulomatous lesions, and severely overgrown or deformed feet are other hoof problems that are seen on the farm that resembles footrot.1,11,13,14 Besides, treponeme infection, laminitis, and primary claw horn lesions with secondary infections were still regarded as likely diagnoses. Thus, detailed clinical examination and laboratory diagnostics should be carried out to differentiate further.2,8

Accordingly, control measures are the most practical way to decrease footrot inception and severity but it is costly. Quarantine of infected sheep, footbaths/soaks, topical medication with zinc and copper sulfate, use of appropriate antibiotics based on microbial sensitivity, vaccination, and combination of the above should be considered as control measures for footrot. However, It is also no guarantee that the disease cannot recur again if control measures are employed.1,11,12,15 The current case report describes the successful management of footrot in Abergele sheep from farms in Mekelle, Ethiopia. Report of the Clinical Case
General Description of the Sheep Farm
The current case was conducted in one of the smallholder sheep farm located in the peri-urban area of Mekelle city. In the area, there were different types of farms constructed for dairy and beef production. The wall of the sheep pen was constructed from galvanized steel and the floor was made of concrete. The pen was unhygienic where it was only cleaned once a week. The farm area was found in mid-altitude and receives a mean annual rainfall ranging from 1500 to 2000 mm. The case was reported during the autumn (March and April) which is one of the wet seasons of the area. Even though the biosecurity and husbandry practice of the farm was poor, the sheep were treated and vaccinated against different diseases such as ectoparasites, acidosis, pasteurellosis, and sheep pox. Clinical Examination and Presentation of Hoof Lesions
A two-years-old ram of Abergele breed weighing around 23kg was submitted to Veterinary Teaching Hospital of Mekelle, Ethiopia with a complaint of walking difficulty due to lesion and injury at the left hindlimb. The owner has raised the sheep intensively and isolated as the condition worsens. The case was reported during the autumn (March and April). On presentation, the ram was dull, depressed with reduced appetite, lameness, and swelling on the interdigital space of the hoof. The detailed physical and clinical examination revealed slough-off and accumulation of necrotic tissue and dirt particles on the ulcerated hoof (Figure 1B) together with foul-smelling pus on the interdigital space of the left hindlimb and the presence of heel erosion in the affected part of the hoof

Treating Foot Rot in your SheepIf you even suspect that one of your sheep may be showing early signs of foot rot it is i...
15/09/2022

Treating Foot Rot in your Sheep
If you even suspect that one of your sheep may be showing early signs of foot rot it is important to pull that animal away from the rest of the flock immediately and to observe, diagnose and treat the animal separately.

What Causes Hoof Rot in Sheep?Fusobacterium necrophorum and Baceroides melaninogenicus – two strains of anaerobic bacter...
15/09/2022

What Causes Hoof Rot in Sheep?
Fusobacterium necrophorum and Baceroides melaninogenicus – two strains of anaerobic bacteria – are the cause of foot rot or hoof rot in sheep. Anaerobic bacteria can survive without oxygen – an important fact to note as oftentimes it is when mud or bedding becomes lodged in between the toes of your animal that the infection can start to afflict your sheep. Typically there is some injury to the skin or flesh of the sheep between the toes which allows for the initial infection. But if your flock has never been affected by foot rot it’s likely that your exposure will be limited to:
New sheep which you purchase and add to your flock
Exposure which occurs at a fair or traveling in a shared trailer (your exposed show animals bring the backteria back to your farm)
A visiting shepherd carries the bacteria from his or her farm on their boots.
If your flock hasn’t been infected before, it’s most common to observe hoof rot in sheep during the summer months. This is because the warm, humid weather will make the skin between your sheep’s toes more prone to cracking which can allow the bacteria into the foot.
Preventing injury to your sheep’s hooves is the best way to prevent hoof rot.

How to Treat and Prevent Sheep Wool FungusRaising, breeding, and exhibiting market lambs and sheep can be both fun and p...
15/09/2022

How to Treat and Prevent Sheep Wool Fungus
Raising, breeding, and exhibiting market lambs and sheep can be both fun and profitable. It can also be a challenge when you are faced with preventing and treating sheep wool fungus. Ringworm in sheep is caused by two different types of fungi: Trichophyton and Microsporum, which could bind parasites to the sheep’s wool.
Ringworm not only spreads among animals, but humans can get it as well. This condition is characterized by skin lesions and can even leave scarring. If you have sheep and market lambs, it’s helpful to know how to spot, treat, and especially prevent all sorts of sheep wool fungus.
What Causes Sheep Wool Fungus?
Sheep wool fungus, or ringworm, was not a common condition until recently. It began making a strong appearance at shows throughout Colorado, New Mexico, and Wyoming beginning in 1989. By 1992, the issue was also a concern in Kentucky, and it has migrated to Tennessee as well.
The fungus can be transmitted among animals, or it can be transmitted through equipment such as sheep blankets, brushes, combs, clippers, and even fences. Sheep that are most susceptible to ringworm infection include:
Animals that have never had ringworm before
Animals with poor nutrition
Young sheep
Sheep that are kept in close contact with infected animals
Animals that are kept in warm, damp, and poorly ventilated areas
Animals that are washed too frequently
Animals that come into contact with infected flies

Ringworm in sheep due to skin infection by the fungus Trichophyton verrucosum is characterised by clearly demarcated, 1 ...
15/09/2022

Ringworm in sheep due to skin infection by the fungus Trichophyton verrucosum is characterised by clearly demarcated, 1 - 10 cm2 areas of hair loss, covered by dry wart-like crusts on the ears, face and wool-less parts of the neck.
Affected animals do not excessively rub or scrape at the lesions. Where the disease has been seen in shearling animals, it has been characterised by raised 4 - 6 cm diameter scabs over the wool-covered parts of the body. When the matted wool covering the lesions is removed, the underlying skin appears inflamed and bleeds readily. Lesions in shearling rams have appeared about 6 weeks after shearing and in some cases the disease has persisted for 6 months.
Ringworm can cause unpleasant skin disease in man, so care should be taken when handling affected animals.
The treatment of ringworm outbreaks in sheep is problematic. An oral ringworm therapy used to be effective for the treatment of the disease in calves, but its use is no longer permitted in food producing animals within the European Community. Topical ringworm treatments may reduce the duration of lesions on the face, but appear to be ineffective for the treatment of body lesions, possibly because the exudate-matted fleece prevents contact between the drug and fungus.
Management of outbreaks of ringworm, therefore, depends on prompt recognition of the clinical signs, isolation of affected animals and treatment of troughs and barriers with a suitable disinfectant. Precautions are required at shearing to avoid spread of infection from lesions on the face to the body of sheep. Your vet can provide further advice about the diagnosis and management of ringworm in your sheep flock.

Fungal diseasesFacial eczema is a serious disease characterised by photosensitisation (sunburn). It is caused by the fun...
15/09/2022

Fungal diseases
Facial eczema is a serious disease characterised by photosensitisation (sunburn). It is caused by the fungus Pithomyces chartarum, which develops on pasture and produces a toxin (sporidesmin) that damages a sheep’s liver. Spore numbers increase in warm, humid weather in late summer and autumn in the North Island, and occasionally in the top third of the South Island. Spores in pasture and sheep can be counted to assess the risk of disease.

Sheep louseThe sheep louse (Bovicola ovis) spends its entire life cycle on the sheep. Lice numbers can build up to creat...
15/09/2022

Sheep louse
The sheep louse (Bovicola ovis) spends its entire life cycle on the sheep. Lice numbers can build up to create a heavy infestation in autumn and winter. Infected sheep can be seen rubbing against fences and often leave behind tags of wool. A lice infestation downgrades the quality of wool and the pelt. The best way to control lice is by dipping all the sheep on the farm three to four weeks after shearing, or by using a pour-on dip immediately after shearing.
Sheep ked
The sheep ked (Melophagus ovinus) is often called a tick, but is a wingless, bloodsucking fly. Its entire life cycle is spent on a sheep, and if dislodged it can survive only about four days. Blood loss from a heavy infestation of keds can cause anaemia in young lambs and reduced production in older sheep. Reduced capillary flow to the skin lowers the quality and quantity of wool, while ked faeces and pupae give it a dirty appearance. Ked numbers build up in cool weather in full-woolled sheep.
Keds can be controlled using a pour-on dip immediately after shearing or a saturation dip three to four weeks later. This parasite has largely been controlled by the annual dipping for lice that was compulsory until the 1980s, and is unlikely to be a problem in the future.

Fly strike (myiasis) was not a problem in the early days of sheep farming in New Zealand. Flies were a nuisance for peop...
15/09/2022

Fly strike (myiasis) was not a problem in the early days of sheep farming in New Zealand. Flies were a nuisance for people and there are plenty of stories of woollen blankets and socks crawling with maggots after being blown by flies. The first reported case of fly strike in sheep is from a South Canterbury farm in 1881. A leading English expert recommended applying coarse whale oil, as the flies would be put off by the strong smell.
Flies are attracted to lay their eggs in dirty, urine- or dung-stained wool, and on wounds. The emerging maggots eat the flesh of the living sheep. If untreated, the sheep will die from secondary complications such as septicaemia or toxaemia. Fly strike can be prevented by crutching to remove dirty wool from the sheep’s tail, and by dipping.

Ovine dermatophytosis, lumpy wool, sheep ringworm, woolrot, was first recognized in the late 1980's. It occurs most comm...
15/09/2022

Ovine dermatophytosis, lumpy wool, sheep ringworm, woolrot, was first recognized in the late 1980's. It occurs most commonly in sheep exhibited at fairs and other shows. The disease is contagious to humans and other animals. Disease occurs when the fungus, a Trichophyton, invades the skin and hair follicles.

10/07/2021

Footrot (or Dichelobacter nodosus) is an infectious and contagious disease that can potentially cause lameness in your flock. Ovine (sheep) footrot has long been dreaded by sheep owners.

Footrot of sheep and goats is a scheduled disease under disease control legislation. This means that:

outbreaks of footrot must be notified to an Inspector of livestock within 7 days
it is illegal to sell infected sheep or goats other than for slaughter
it is illegal to place footrot infected sheep in or adjacent, to any saleyard or in any public place (including a road)
infected sheep must be treated
inspectors of livestock have the power to test and restrict movement of infected or suspect sheep and to ensure treatment is carried out
Strains of the bacteria
Dichelobacter nodosus (D. nodosus) bacteria are divided into a number of sub-groups, strains or serotypes identified by a letter of the alphabet. An outbreak of footrot may involve one or several serotypes.

It attacks by digesting the connective tissue between the horn and flesh of the hoof, and also under the horn of the foot.

The virulence varies widely between the various strains of bacteria. Most bacteria fall somewhere between the benign and virulent extremes.

For practical purposes the range is divided in two and each case referred to as either Benign or Virulent.

When assessing virulence by examining feet it is important to consider the environment of the sheep's foot and the time since infection occurred.

Benign footrot
Benign footrot is bacteria of low virulence which have poor ability to under-run the hoof horn and mostly affect the skin between the toes.

Benign footrot can be controlled during the active stages by foot bathing. This may be repeated as often as required.

Moving sheep on to drier country is often sufficient to help recovery. However, the disease is likely to recur in the next favourable season.

If regular footbathing is required to control the disease then it is possible that virulent footrot is present and a different approach needs to be taken to treatments, control and eradication.

Virulent footrot
Virulent footrot bacteria rapidly under-run and separate the hoof horn from the foot.

Ideal environment for the bacteria
D.nodosus requires warm, moist conditions for ideal multiplication. The bacteria can only survive away from the foot for a maximum of 7 days, even in ideal conditions. In less favourable dry conditions, the bacteria die rapidly.

How the bacteria is spread
Spread is primarily from foot to foot via pasture or mud so moist pastures, laneways and muddy yards are the main areas where footrot is spread.

Footrot will therefore spread most rapidly when it is warm and moist, as in spring and some autumns.

What kills D. nodosus?
Footrot bacteria are readily killed by dry heat, sunlight, cold, dry environment and a number of different chemicals. Most domestic disinfectants will destroy D. nodosus but are not registered or recommended for treating sheep as they are easily de-activated by dirt contamination.

Zinc Sulphate, 'Radicate' and formalin (Formalin, Formol) are the chemicals currently registered for the treatment of footrot in footbaths.

Immunity to footrot
Sheep that have been infected with or exposed to footrot do not develop any significant natural immunity or resistance. Short term immunity can be achieved using vaccines.

Breed of sheeps susceptible to footrot
All breeds of sheep and goats can contract footrot, although British breeds are less susceptible.

Foot shape and structure affect susceptibility.
Goats are usually less severely affected, and may exhibit different symptoms to sheep infected with the same strain of bacteria.
Merinos are often the most susceptible and severely affected.
Low virulence strains are most severe in Merinos but are also seen in British breeds, goats and cattle.
There are a few strains of sheep which are resistant to footrot but at present they are of no commercial significance.

10/07/2021

Foot Rot/ Foul in the Foot
Cause
Footrot or foul in the foot is a subacute or acute necrotic infection originating from a lesion in the interdigital skin that leads to a cellulitis in the digital region.

Mechanical injury or softening and thinning of the interdigital (between the toes) skin by puncture wounds or continuous exposure to wet conditions are necessary to provide entrance points for infectious agents.

Fusobacterium necrophorum is considered to be the major cause of footrot. It can be isolated from f***s, which may explain why control is difficult. Other organisms, such as Staphylococcus aureus , Escherichia coli , Arcanobacterium (Actinomyces) pyogenes , and possibly Bacteroides melaninogenicus , can also be involved.

Footrot has a worldwide distribution and is usually sporadic but may be endemic in intensive beef or dairy cattle production units. The incidence varies according to weather, season of year, grazing periods, and housing system. On average, footrot accounts for around 15 per cent of claw diseases.

Symptoms
Severe lameness
Animal holds leg in air to relieve pressure
Swelling of interdigital space
Fever
Anorexia
Reduced milk yield
Hind feet are affected most often and cattle tend to stand and walk on their toes.
Treatment
Treatment of footrot is relatively straightforward and if instituted early in the course of the disease is usually successful. Remember all lame feet are not necessarily footrot however; there are other conditions that look similar.

Historically, an antiseptic and bandage were applied after cleaning and trimming the foot, but topical treatment and bandaging are considered less important than systemic therapy. Prompt diagnosis and initiation of antimicrobial therapy are essential to achieve a satisfactory response. The treatment of choice is parenteral antibiotics administered for three to five days.

In cattle that are difficult to handle, feed additives can be used to treat large numbers - however veterinarian advice should be sought.

If improvement is not evident within three to four days, it may mean the infection has invaded the deeper tissues. Infections that do not respond to initial treatments need to be re-evaluated by your veterinarian in a timely manner. He or she will want to determine if re-cleaning, removing all infected tissue, application of a topical antimicrobial, and bandaging are appropriate, along with an antimicrobial change.

In the more severe cases, management of the animal will be between salvaging for slaughter (following drug withdrawal times), claw amputation, or in valuable animals, claw-salvaging surgical procedures.

Prevention
Preventive measures include removing sources of injury and keeping feet dry and clean.

Animals that are actively shedding infectious organisms should be isolated until signs of lameness have disappeared. If this is not possible, a waterproof dressing or protective boot should be applied; however, animals wearing protective boots should be monitored carefully to avoid additional damage. Boots should be disinfected between use.

Because busy traffic areas are invariably heavily contaminated, steps should be taken to ensure that areas around drinking troughs, gateways, and tracks are adequately drained. Animals at pasture might be moved to a clean, dry area, or possibly housed during periods of heavy rainfall. Contaminated concrete must be frequently cleaned and scraped free of manure. Preventive use of a footbath with an antiseptic and astringent solution (eg, copper or zinc sulfate) has given beneficial results. Formaldehyde solution can also be used, but in some areas it is considered to be an environmental hazard if discharged into natural waterways.

Ethylenediamine dihydroiodide has been used as a feed supplement for prevention, but the results are extremely uncertain. Vaccines against F necrophorum have failed because of the weak immune response to the bacterium. High levels of zinc fed as a supplement have a beneficial effect by improving epidermal resistance to bacterial invaders.

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