Acute viral myositis:

Viral causes:

Influenza virus: Acute benign myositis or rhabdomyolysis.
Coxsackie B virus: Bornholm disease or epidemic myalgia

AIDS myopathy:

HIV associated myopathy: Similar to seronegative polymyositis
Muscle biopsy:

• HIV antigens in the endomysial and perivascular macrophages are usually present
• Muscle fibres express MHC-1 molecules
• Primary muscle lymphoma can occur in AIDS patients

Related articles:

• Myopathy,
• polymyositis, zidovudine myopathy, pyomyositis, toxoplasmic polymyositis, nemaline myopathy (acquired)