Ulcerative dermatitis, thrombocytopenia, and neutropenia in neonatal foals.

The research study describes cases of neonatal foals suffering from ulcerative dermatitis, severe thrombocytopenia, and mild neutropenia. These symptoms improved over time and with supportive treatments.

Understanding the study

In this study, six foals from four different mares, all from different regions in the United States, were observed. The foals were under 4 days old and exhibited symptoms like:

• Ulcers in the oral and lingual regions
• Crusting and erythema around the eyes, muzzle, and certain body regions
• Severe drop in the count of platelets
• White blood cells and neutrophils in low concentrations
• Petechiae and ecchymotic hemorrhages in some cases
• A tendency to bleed in three of the foals

Diagnostic tests and findings

A series of tests were performed on the foals:

• An examination of a bone marrow biopsy from one foal revealed no abnormalities
• A platelet surface immunoglobulin test in another came out to be negative
• The skin showed clefting beneath the epidermis, dilation of the underlying vascular structure, dermal hemorrhage, and necrosis of superficial papillae

Treatment and prognosis

The foals were offered supportive treatment that included:

• Broad-spectrum antibiotics (used for 5 foals)
• Corticosteroids (used for 3 foals)
• Gastric ulcer prophylaxis (used for all 6 foals)
• Whole-blood transfusion (used for 4 foals)
• Platelet-rich plasma (used for 1 foal)

Symptoms, particularly skin lesions and blood platelet count, showed improvement in two weeks for four of the six foals. The treatment had to be extended for two foals when their platelet counts decreased after corticosteroid doses were reduced.

Outcome and further observations

All six foals survived and appeared healthy as they grew older. Two mares that had given birth to two affected foals each produced healthy foals in subsequent pregnancies when the colostrum was replaced with a different source. This led researchers to consider the possible role of colostral antibodies or any other element in the colostrum in causing thrombocytopenia and skin lesions in the newborn foals, warranting further investigation to affirm or reject this hypothesis.