South Africa has reported the highly pathogenic H5N1 strain of avian influenza, or bird flu, on two poultry farms in the country, the World Organisation for Animal Health said on Wednesday.

At 21-42 days post-vaccination, the geometric mean haemagglutination inhibition titres were 32% higher for H1N1, 55% for H3N2, and 39% for B strains among recipients of the high-dose vaccine than ...

A single mutation in the H5N1 strain of avian influenza that is infecting cattle in the US could make it more likely to infect humans, according to a new scientific paper. The worrying finding has ...

Moderna today reported promising relative vaccine efficacy (rVE) findings from a phase 3 trial of its seasonal mRNA flu ...

The current H5N1 outbreak began in 2022 and intensified throughout the Biden administration. By early 2025, the virus had affected over 130 million birds, including both wild and domestic populations.