Enlarge / The influenza virus from an image produced with transmission electron microscopy. Viral diameter ranges from around 80 to 120 nm. (credit: Getty | BSIP) A person in Missouri with no reported exposure to animals was confirmed to have been infected with H5-type bird flu, the Missouri Department of Health and Senior Services (MDHSS) announced late Friday. MDHSS reported that the person, who has underlying medical conditions, was hospitalized on August 22 and tested positive for an influenza A virus.