[Problems concerning the prevention of infections in chronic obstructive respiratory diseases].
D000293:Adolescent; D000328:Adult; D000368:Aged; D001249:Asthma / Q000150:complications*; D001991:Bronchitis / Q000150:complications*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011656:Pulmonary Emphysema / Q000150:complications*; D012141:Respiratory Tract Infections / Q000517:prevention & control*; D013183:Sputum / Q000382:microbiology