RSV (Respiratory Synctival Virus) is a primarily seasonal virus that we see in children. This can also be seen in geriatric populations. RSV has a higher mortality for children than COVID 19.
You can look this up at CDC.org Increased Interseasonal Respiratory Synctival Virus (RSV) Activity in Parts of the Southern United States. It was published on June 10, 2021. There is also a copy provided below.