S. aureus and P. aeruginosa are the two most common bacterial infections in people with cystic fibrosis.
S. aureus is normally found on human skin and mucous membranes. Drug-resistant strains can cause severe lung disease in people with cystic fibrosis.
P. aeruginosa is commonly found in soil and water. It’s a major cause of lung infection in people with cystic fibrosis.