Trimester-dependent vertical transmission of H5N1 influenza virus through placental and mammary routes impairs offspring development

Nature Communications, Published online: 21 August 2026; doi:10.1038/s41467-026-76891-9 Researchers found H5N1 bird flu can spread from pregnant mice to fetuses through the placenta and to newborns through milk, causing developmental delays, smaller size, and behavioral problems, highlighting pregnancy-related risks in mammals. The post Trimester-dependent vertical transmission of H5N1 influenza…