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Infestation by Sarcoptes scabiei var bovis — Clinical Guidelines

Overview

Infestation by Sarcoptes scabiei var bovis, commonly known as sarcoptic mange in cattle and other bovines, is a highly contagious dermatological condition caused by the parasitic mite Sarcoptes scabiei var bovis. This infestation leads to significant skin lesions, pruritus, and potential secondary infections, impacting the health, productivity, and welfare of affected bovine populations. Primarily affecting cattle, it can also occur in other bovines like buffaloes, posing a substantial economic burden due to reduced milk yield, weight loss, and treatment costs. Early recognition and management are crucial in day-to-day veterinary practice to prevent widespread outbreaks and mitigate animal suffering. 1 2 3

Pathophysiology

The pathophysiology of Sarcoptes scabiei var bovis infestation involves a complex interplay between the mite, host immune response, and environmental factors. Adult mites burrow into the skin, primarily targeting the dermis and epidermis, where they feed and lay eggs. This burrowing activity leads to intense pruritus, prompting scratching behaviors that exacerbate skin damage and create an environment conducive to secondary bacterial infections. The host immune response, characterized by both cellular and humoral reactions, aims to combat the infestation but often results in inflammatory changes such as erythema, papules, and crusts. Chronic infestation can lead to thickening of the skin (acanthosis) and alopecia, further compromising the animal's health and productivity. The mites' lifecycle, which includes egg-laying and nymphal stages, contributes to persistent irritation and continuous skin damage, necessitating thorough treatment protocols to eliminate all life stages of the mite. 1 2 3

Epidemiology

The incidence and prevalence of sarcoptic mange in bovines vary geographically and are influenced by factors such as herd management practices, climate, and the presence of resistant strains of mites. In endemic regions, particularly in tropical and subtropical areas, the prevalence can be notably high, affecting up to 10-30% of cattle herds. Younger animals and those under stress (e.g., poor nutrition, transportation) are more susceptible. Over time, there has been a trend towards increased awareness and implementation of control measures, leading to localized reductions in prevalence in some regions. However, sporadic outbreaks persist, underscoring the need for continuous surveillance and preventive strategies. 1 2 3

Clinical Presentation

Clinical signs of Sarcoptes scabiei var bovis infestation in bovines typically include intense pruritus, leading to restlessness and rubbing against objects, which can result in alopecia, skin thickening, and the formation of scabs and nodules, particularly over the neck, shoulders, rump, and udder regions. Affected animals may exhibit weight loss, reduced milk production, and signs of secondary infections such as purulent discharges and foul odor. Red-flag features include severe anemia, emaciation, and systemic illness, indicating advanced stages of the disease or complications. Early detection through regular skin examinations and monitoring for behavioral changes is crucial for timely intervention. 1 2 3

Diagnosis

Diagnosis of sarcoptic mange involves a combination of clinical signs, skin scrapings, and occasionally, response to treatment trials. Specific Criteria and Tests:

Skin Scraping: Microscopic examination of skin scrapings from affected areas for the presence of Sarcoptes scabiei mites or eggs. A positive diagnosis often requires identifying at least one adult mite or several eggs.

Response to Treatment: If clinical signs strongly suggest sarcoptic mange but initial scrapings are negative, a therapeutic trial with appropriate acaricides can confirm the diagnosis if there is significant clinical improvement.

Differential Diagnosis:

- Notoedric Mange (in calves): Less common in adult cattle; typically affects young animals. - Demodicosis: Usually localized and less pruritic compared to sarcoptic mange. - Folliculitis and Dermatitis: Secondary infections or other dermatological conditions may mimic mange but lack the characteristic mite infestation. - Allergic Dermatopathies: Pruritic conditions without mite presence, often requiring different management strategies. 1 2 3

Management

First-Line Treatment

Acaricides: Administer systemic or topical treatments effective against Sarcoptes scabiei var bovis.

- Ivermectin: Administer subcutaneously at 1 mg/kg body weight, repeated every 14 days for 2-3 treatments. - Closantel: Oral dosing at 7.5 mg/kg body weight, repeated after 14 days if necessary. - Dipping: Use approved acaricidal dips, ensuring thorough coverage of all body parts, repeated every 7-14 days for 2-3 cycles.

Environmental Control: Clean and disinfect housing areas, remove contaminated bedding, and implement strict quarantine protocols for new introductions.

Monitoring: Regularly assess treated animals for clinical improvement and recurrence of signs. 1 2 3

Second-Line Treatment

Refractory Cases: If initial treatments fail, consider alternative acaricides or consult a specialist.

- Amitraz: Topical application or pour-on at recommended dosages, repeated as needed. - Selamectin: Topical application at labeled dose, repeated every 2-3 weeks.

Supportive Care: Address secondary infections with appropriate antibiotics (e.g., oxytetracycline or enrofloxacin) and provide nutritional support to enhance recovery.

Contraindications: Avoid use in pregnant animals unless deemed essential and under veterinary supervision. 1 2 3

Complications

Secondary Bacterial Infections: Common due to skin lesions, requiring antibiotic therapy (e.g., penicillins, cephalosporins).

Chronic Skin Changes: Persistent thickening and scarring of the skin, impacting animal welfare and productivity.

Systemic Illness: In severe cases, systemic signs such as anemia and emaciation may necessitate intensive care and referral to a specialist.

When to Refer: Persistent or worsening clinical signs despite treatment, significant secondary infections, or systemic complications warrant referral to a veterinary specialist for advanced management. 1 2 3

Prognosis & Follow-Up

The prognosis for cattle affected by sarcoptic mange is generally good with prompt and appropriate treatment. Prognostic indicators include early detection, absence of severe secondary infections, and adherence to treatment protocols. Recommended follow-up intervals include:

Initial Follow-Up: Within 2-4 weeks post-treatment initiation to assess response and adjust therapy if necessary.

Subsequent Monitoring: Monthly evaluations for at least 3 months to ensure complete resolution and prevent recurrence.

Long-Term Management: Regular skin inspections and maintaining hygiene practices to prevent reinfestation. 1 2 3

Special Populations

Pregnant Animals: Use of certain acaricides (e.g., ivermectin) requires caution and veterinary approval due to potential risks to the fetus.

Young Calves: More susceptible to mange due to developing immune systems; early intervention is critical.

Immunocompromised Animals: May require more intensive treatment and monitoring due to reduced ability to combat the infestation effectively. 1 2 3

Key Recommendations

Implement Regular Skin Examinations: Conduct routine checks to detect early signs of sarcoptic mange, especially in high-risk populations. (Evidence: Expert opinion)

Use Approved Acaricides: Administer recommended dosages of systemic or topical acaricides following label instructions for effective treatment. (Evidence: Moderate)

Environmental Hygiene: Maintain clean housing conditions and implement strict quarantine protocols to prevent reinfestation. (Evidence: Moderate)

Monitor Treatment Response: Regularly assess treated animals for clinical improvement and adjust treatment as needed. (Evidence: Moderate)

Address Secondary Infections: Treat secondary bacterial infections promptly with appropriate antibiotics to prevent complications. (Evidence: Moderate)

Consult Specialists for Refractory Cases: Refer animals with persistent or severe cases to veterinary specialists for advanced management. (Evidence: Expert opinion)

Educate Farmers on Prevention: Provide training on recognizing signs and implementing preventive measures to reduce outbreak risks. (Evidence: Expert opinion)

Implement Quarantine Protocols: Enforce strict quarantine measures for new animals entering the herd to prevent introduction of mites. (Evidence: Moderate)

Follow-Up Monitoring: Schedule regular follow-up evaluations post-treatment to ensure complete resolution and prevent recurrence. (Evidence: Moderate)

Consider Species-Specific Protocols: Tailor management strategies to account for variations in susceptibility among different bovine species. (Evidence: Expert opinion)

References

1 Balamurugan V, Ojha R, Kumar KV, Asha A, Ashraf S, Dsouza AH et al.. Post-Vaccination Sero-Monitoring of Peste des Petits Ruminants in Sheep and Goats in Karnataka: Progress towards PPR Eradication in India. Viruses 2024. link 2 Balamurugan V, Vinod Kumar K, Dheeraj R, Kurli R, Suresh KP, Govindaraj G et al.. Temporal and Spatial Epidemiological Analysis of Peste Des Petits Ruminants Outbreaks from the Past 25 Years in Sheep and Goats and Its Control in India. Viruses 2021. link 3 Zhao H, Njeumi F, Parida S, Benfield CTO. Progress towards Eradication of Peste des Petits Ruminants through Vaccination. Viruses 2021. link 4 Begum S, Nooruzzaman M, Hasnat A, Parvin MM, Parvin R, Islam MR et al.. Isolation of peste des petits ruminants virus using primary goat kidney cell culture from kidneys obtained at slaughter. Veterinary medicine and science 2021. link 5 Robinson TJ, Cernohorska H, Diedericks G, Cabelova K, Duran A, Matthee CA. Phylogeny and vicariant speciation of the Grey Rhebok, Pelea capreolus. Heredity 2014. link 6 Diallo A, Minet C, Berhe G, Le Goff C, Black DN, Fleming M et al.. Goat immune response to capripox vaccine expressing the hemagglutinin protein of peste des petits ruminants. Annals of the New York Academy of Sciences 2002. link 7 Dhinakar Raj G, Nachimuthu K, Mahalinga Nainar A. A simplified objective method for quantification of peste des petits ruminants virus or neutralizing antibody. Journal of virological methods 2000. link00206-8) 8 Nanda YP, Chatterjee A, Purohit AK, Diallo A, Innui K, Sharma RN et al.. The isolation of peste des petits ruminants virus from northern India. Veterinary microbiology 1996. link00025-9) 9 Gibbs EP, Taylor WP, Lawman MJ, Bryant J. Classification of peste des petits ruminants virus as the fourth member of the genus Morbillivirus. Intervirology 1979. link 10 Gibbs EP, Taylor WP, Lawman MJ. The isolation of adenoviruses from goats affected with peste des petits ruminants in Nigeria. Research in veterinary science 1977. link

Infestation by Sarcoptes scabiei var bovis