Not sure which one I had, but I was felled by it on Xmas Eve. No particularly bad symptoms other than feeling totally whacked and shivering/sweating when I went to bed about 8pm. Stayed in bed for most of the week. Took a couple more weeks before I started to feel “normal” (whatever that is).
Our TM (young bloke - about 30) was hospitalised by it and is still off work over a month later…