H5N1 bird flu research reveals new detection tools and cattle infection mechanisms

Researchers have developed a new antibody test and identified the biological mechanisms behind the spread of H5N1 bird flu in mammals.

A new double-antigen ELISA assay, utilizing luciferase-based detection technology, has been validated to detect H5-specific antibodies across a wide range of species, including birds, cattle, pigs, ferrets, and humans. This addresses a critical gap in surveillance, as previous tests were primarily optimized for poultry and lacked reliability when applied to various mammalian species.

Additionally, scientists at the University of Pittsburgh School of Public Health have explained why H5N1 infections in U.S. dairy cattle primarily targeted udders rather than lungs. The study found that the molecular structures the virus uses to attach to cells were abundant in mammary tissue but nearly absent in the cows' airways. This biological mechanism explains why the disease presented differently in cattle compared to other mammals, where respiratory infection is more common.