Virus With No Vaccine Spreads Across US States as Doctors Warn About Rising HMPV Cases Virus With No Vaccine Spreads Across US States as Doctors Warn About Rising HMPV Cases By Amelia Clark on March 20, 2026 Doctors are warning about rising cases of human metapneumovirus across parts of the United States. The respiratory virus has no vaccine or specific treatment and can cause serious illness in vulnerable groups. Continue readingVirus With No Vaccine Spreads Across US States as Doctors Warn About Rising HMPV Cases