It's probably a combination of several such as COVID, flu, rsv, and noravirus. I know that I got COVID just recently and so did my kids. I know someone whose baby was just hospitalized for RSV. And a few who have been sick with the flu I doubt it's just one illness causing it. It's the combination of a lot of colds that happen during this time and it's getting worse because climate change. The warmer climate actually makes it easier for these kinds of things to spread.