Pneumonia caused by varicella infection is a serious and severe complication of the disease when it occurs in adults. The authors report two cases of a varicella pneumonia in a 36 and a 41 year-old non-immunocompromised man. They were admitted to hospital for acute respiratory failure, not requiring intensive care, associated with exanthema. High resolution CT revealed well-defined diffuse nodules throughout both lungs, nodules with a surrounding halo of ground-glass opacity. Thrombocytopenia, hepatic cytolysis and an increase in lacticodeshydrogenase were noted. The patients made a full recovery with anti-viral therapy and oxygen therapy. Varicella pneumonia is the most common complication of varicella in adults. Anti-viral treatment is usually successful.