UBC study finds H5N1 mutations in Canadian case weakened human cell binding

Researchers at the University of British Columbia have released new findings regarding Canada’s first confirmed human case of H5N1 avian influenza, which occurred in a British Columbia teenager in November 2024. The study, published in Nature Communications, investigated specific genetic mutations found in the virus that had previously raised concerns about its ability to adapt to human hosts.

While scientists initially speculated that certain mutations on the virus's surface protein might signal an increased ability to infect humans, the UBC team’s analysis suggests the opposite. Using cryo-electron microscopy to map the protein structure at near-atomic detail, researchers found that these mutations actually weakened the virus’s ability to bind to human cells.

This research highlights the complexities of monitoring zoonotic diseases. While genetic sequencing can identify new mutations, the study demonstrates that a virus’s genetic code does not always provide a clear indication of how those changes will affect its behavior or pandemic potential.