Immune cell pathology in rabbit hemorrhagic disease

Area of Science:

• Veterinary Virology
• Immunology
• Pathology

Background:

• Rabbit hemorrhagic disease (RHD) is a severe viral infection affecting rabbits.
• Understanding the host immune response is crucial for managing RHD outbreaks.

Purpose of the Study:

• To investigate the impact of rabbit hemorrhagic disease virus (RHDV) on the host immune system.
• To analyze cellular changes in lymphoid organs and serum cytokine levels.

Main Methods:

• Rabbits were inoculated with RHDV, and control groups were maintained.
• Cellular composition and cytopathology of blood, bone marrow, spleen, lymph nodes, and liver were examined.
• Serum levels of tumor necrosis factor-alpha (TNF-α) and interferon-gamma (IFN-γ) were quantified.

Main Results:

• RHDV infection led to decreased leukocyte counts with a shift towards immature cells.
• Increased levels of inflammatory cytokines (TNF-α, IFN-γ) were observed.
• Pathological changes included hyperactivated macrophages with viral inclusions and emperipolesis.

Conclusions:

• RHDV induces significant leukocyte pathology characterized by hyperactivation and immaturity.
• Macrophages play a key role in RHD pathogenesis, showing cytopathic effects and viral replication.
• The study highlights RHDV-induced immune dysregulation and inflammation.