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Alloimmune neonatal neutropenia and neonatal isoerythrolysis in a Thoroughbred colt.

Abstract: A 3-day-old Thoroughbred colt was originally presented for treatment of neonatal isoerythrolysis, which was treated with a blood transfusion. However, persistent neutropenia was observed despite the absence of detectable infection. Subsequently, a granulocyte agglutination test was performed by incubating the colt's neutrophils with the mare's serum; results were positive, leading to a clinical diagnosis of alloimmune neonatal neutropenia. The diagnosis was further supported via flow cytometric analysis. The colt was hospitalized and treated prophylactically with antimicrobials and 4 separate doses of recombinant human granulocyte colony-stimulating factor (rhG-CSF; 1.4-3.5 µg/kg, subcutaneously) in attempts to maintain the neutrophil count within reference intervals over a 4-week period. The colt's neutrophil count increased after administration of rhG-CSF and eventually stabilized within reference intervals by day 20. The colt maintained normal neutrophil counts after discharge and was reportedly healthy at 6 months of age. Alloimmune neonatal neutropenia should be considered in foals with persistent neutropenia in the absence of infection. Alloimmune neonatal neutropenia can be treated with prophylactic antimicrobials combined with rhG-CSF with a favorable outcome.
Publication Date: 2011-10-06 PubMed ID: 22362958PubMed Central: PMC10619328DOI: 10.1177/1040638711416850Google Scholar: Lookup
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Summary

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The research article discusses the case of a 3-day-old Thoroughbred colt diagnosed with alloimmune neonatal neutropenia and neonatal isoerythrolysis, successfully treated with prophylactic antimicrobials and recombinant human granulocyte colony-stimulating factor (rhG-CSF).

Case Description

  • The Thoroughbred colt was initially diagnosed with neonatal isoerythrolysis, a condition that occurs when the newborn’s own antibodies attack its red blood cells, causing anemia.
  • A blood transfusion was performed to resolve this issue. However, the young colt still showed persistent neutropenia, a low count of neutrophils (a type of white blood cell).

Diagnosis

  • Neutropenia in the absence of detectable infection led veterinarians to suspect another underlying health condition. A granulocyte agglutination test was then conducted, which yielded a positive result.
  • The test involved combining the colt’s neutrophils with the mare’s serum. The positive result indicated an immune response by the colt’s body against its own neutrophils. This led to a clinical diagnosis of alloimmune neonatal neutropenia.
  • The diagnosis was also confirmed via flow cytometric analysis, a method that helps to measure physical and chemical characteristics of biological cells.

Treatment and Outcome

  • After the diagnosis, the colt was hospitalized and was prophylactically given antimicrobial medications. Moreover, 4 isolated doses of recombinant human granulocyte colony-stimulating factor (rhG-CSF) was administrated subcutaneously to stimulate the production of more neutrophils.
  • This treatment regimen was effective. The colt’s neutrophil count elevated after the rhG-CSF administration and stabilized within the normal range after 20 days.
  • The colt continued to maintain normal neutrophil counts after discharge and was still healthy 6 months later.

Implication

  • This case study suggests alloimmune neonatal neutropenia should be considered as a potential diagnosis in foals with consistent neutropenia in the absence of infection.
  • The successful treatment outcome from this case suggests that alloimmune neonatal neutropenia can effectively be managed through a combination of prophylactic antimicrobials and rhG-CSF.

Cite This Article

APA
Wong DM, Alcott CJ, Clark SK, Jones DE, Fisher PG, Sponseller BA. (2011). Alloimmune neonatal neutropenia and neonatal isoerythrolysis in a Thoroughbred colt. J Vet Diagn Invest, 24(1), 219-226. https://doi.org/10.1177/1040638711416850

Publication

ISSN: 1943-4936
NlmUniqueID: 9011490
Country: United States
Language: English
Volume: 24
Issue: 1
Pages: 219-226

Researcher Affiliations

Wong, David M
  • Lloyd Veterinary Medical Center, Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, USA.
Alcott, Cody J
    Clark, Sandra K
      Jones, Douglas E
        Fisher, Phyllis G
          Sponseller, Brett A

            MeSH Terms

            • Animals
            • Animals, Newborn / immunology
            • Anti-Infective Agents / therapeutic use
            • Blood Transfusion / veterinary
            • Diagnosis, Differential
            • Erythroblastosis, Fetal / diagnosis
            • Erythroblastosis, Fetal / therapy
            • Erythroblastosis, Fetal / veterinary
            • Flow Cytometry / veterinary
            • Granulocyte Colony-Stimulating Factor / therapeutic use
            • Horse Diseases / diagnosis
            • Horse Diseases / immunology
            • Horses
            • Leukocyte Count / veterinary
            • Male
            • Neutropenia / diagnosis
            • Neutropenia / drug therapy
            • Neutropenia / immunology
            • Neutropenia / veterinary
            • Neutrophils
            • Recombinant Proteins / therapeutic use

            Grant Funding

            • R15 HL103488 / NHLBI NIH HHS
            • R15 HL103 488-01 / NHLBI NIH HHS

            Conflict of Interest Statement

            Declaration of conflicting interests. The authors declared that they had no conflicts of interests in their authorship and publication of this contribution.

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            Citations

            This article has been cited 1 times.
            1. Endo Y, Hobo S, Korosue K, Ootsuka K, Kitauchi A, Kikkawa R, Hidaka Y, Hagio M, Tsuzuki N. Effects of low-dose G-CSF formulation on hematology in healthy horses after long-distance transportation. J Vet Med Sci 2015 Apr;77(4):507-9.
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