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Chronic Pseudomonas aeruginosa lung infection is an endobronchiolitis characterized by the microcolony mode of growth (biofilm). Early colonization is treated with oral ciprofloxacin combined with colistin inhalation. Chronic infection is treated with "maintenance chemotherapy" consisting of beta-lactam antibiotics and tobramycin intravenously in combination with colistin inhalation four times yearly.
Niels Høiby (1993) studied this question.
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