Preparing hemagglutinating antigen from isolates of infectious bronchitis virus

Area of Science:

• Veterinary Virology
• Immunology

Background:

• Infectious bronchitis virus (IBV) is a significant avian pathogen.
• Hemagglutinating (HA) activity is a key viral characteristic used in diagnostics and research.

Purpose of the Study:

• To investigate the hemagglutinating (HA) activity of 14 infectious bronchitis virus (IBV) strains.
• To establish optimal conditions for IBV antigen preparation for HA assays.

Main Methods:

• Specific pathogen-free embryonated eggs (10-11 days old) were inoculated via the allantoic cavity with IBV.
• Virus-rich allantoic fluid was concentrated by ultracentrifugation.
• Virus pellets were treated with phospholipase-C and incubated to prepare antigen.

Main Results:

• All 14 tested IBV strains exhibited positive hemagglutinating activity against chicken red blood cells.
• Optimal antigen preparation involved specific incubation times, temperatures, and enzyme treatment.
• Prepared antigen demonstrated stability when stored liquid or lyophilized at 4°C.

Conclusions:

• Infectious bronchitis virus (IBV) possesses hemagglutinating (HA) properties.
• Standardized methods for IBV antigen preparation enable reliable HA testing.
• The developed antigen preparation protocol is suitable for diagnostic and research applications.