Cases of human metapneumovirus, or HMPV, are on the rise in parts of California. It typically causes mild, cold-like symptoms, but could lead to more-severe disease in vulnerable individuals.
A respiratory virus that doesn't have a vaccine or a specific treatment regimen is spreading in some parts of California — but there's no need to sound the alarm just yet, public health officials say.
A majority of Northern California communities hav... [5193 chars]