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There is no known cure for cystic fibrosis. Lung infections are treated with antibiotics which may be given intravenously, inhaled, or by mouth. Sometimes, the antibiotic azithromycin is used long-term. Inhaled hypertonic saline and salbutamol may also be useful. Lung transplantation may be an option if lung function continues to worsen. Pancreatic enzyme replacement and fat-soluble vitamin supplementation are important, especially in the young. Airway clearance techniques such as chest physiotherapy may have some short-term benefit, but long-term effects are unclear. The average life expectancy is between 42 and 50 years in the developed world, with a median of 40.7 years. Lung problems are responsible for death in 70% of people with cystic fibrosis.