I would like info on myositis - virus?

Inflammation: myositis in by definition an inflammation of muscle. It can be viral, fungal or bacterial. Biopsy is the definitive method.

Myositis info: Myositis(inflammation of the muscle) can result from mainly things including dehydration, medications, autoimmune disorders, sometimes viruses(although not too common), and even diet. A lab test called CPK can be performed which will be elevated in Myositis. Treatment often involves either eliminating the offending agent(medicines,foods) and sometimes some medications such as Prednisone

It is possible: Myositis means muscle inflammation, and can be caused by infection or trauma.