I have 3 children (all adults now) & grandchildren, I've never heard of RSV before.

From the CDC:

Respiratory syncytial (sin-SISH-uhl) virus, or RSV, is a common respiratory virus that usually causes mild, cold-like symptoms. Most people recover in a week or two, but RSV can be serious. Infants and older adults are more likely to develop severe RSV and need hospitalization. Vaccines are available to protect older adults from severe RSV. Monoclonal antibody products are available to protect infants and young children from severe RSV.

So in other words it's a cold? How long has this been around? And they of course have a vaxx for a child's cold.