A 59-year-old man in Mexico who contracted a type of bird flu known as A(H5N2) died in April, the World Health Organization said June 5Trusted Source. This is the first laboratory-confirmed human case of infection with an A(H5N2) virus worldwide, and the first avian H5 virus reported in a person in Mexico, the WHO said. “These viruses, such as H5N1 and now H5N2, primarily circulate among birds, with occasional spillover into mammals, including humans, under the right circumstances,” said Daniel Pastula, MD, MHS, chief of neuro-infectious diseases and global neurology at the University of Colorado and Colorado School of Public Health.