By Hugo Francisco de Souza Reviewed by Susha Cheriyedath, M.Sc. Jan 5 2025 Evidence of bird flu infections in horses signals a new frontier in viral spillover risks, demanding urgent action to monitor and mitigate cross-species transmission. Research Letter: Evidence of Influenza A(H5N1) Spillover Infections in Horses, Mongolia . Image Credit: kagemusha /  Shutterstock In a recent study published in the journal Emerging Infectious Diseases , researchers screened samples from almost 1,000