Interesting! Although my PMR was initially triggered by Covid, and actually worsened by a second bout of Covid a year later, I had the flu last fall and took TamiFlu and while on the TamiFlu my PMR symptoms went completely away! There’s definitely something happening in the immune system. Seems so crazy that having Covid could trigger PMR and at the same time alleviate it. And why did taking Tamiflu clear all pain and weakness for me?? I hope someone can answer these questions soon. It may be an answer to cure PMR.