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Development of an Enzyme-Linked Immunosorbent Assay to Detect Chicken Serum Antibody to Glycoprotein G of Infectious Laryngotracheitis Virus

Important Findings Infectious laryngotracheitis (ILT) is a significant upper respiratory tract disease of chickens and has a worldwide distribution. Diagnostic enzyme-linked immunosorbent assays (ELISAs) are commonly used in ILT disease control programs. These ELISAs generally detect serum antibody to infectious laryngotracheitis virus (ILTV) and frequently utilize whole virus as the ELISA antigen. This study investigated the use of recombinant glycoprotein G (gG) of ILTV as an alterative to the use of whole virus antigen. The results showed that the gG-His ELISA has the potential to serve as a companion diagnostic tool in conjunction with the gG-ve ILTV vaccine in a ‘‘differentiating-infected-from-vaccinated-animals’’ (DIVA) approach to the control of ILT.