Study on the serological type and in vitro antibiotic sensitivity of Pseudomonas aeruginosa from the sputum of the elderly patients with lung infections

68 strains of Pseudomonas aeruginosa isolated from the sputum of the elderly patients with lung infections, their serological types were identified. The result showed that most of 68 strains (73.5%) belonged to type 6, 2, 11, 19 and 1. Antibiotic sensitivities of these strains to 15 antibiotics were also detected. The sensitive rate to ciprofloxacin was the highest (86.76%), followed by polymyxin B (83.8%). Resistance to ampicillin was the highest (97.1%). All strains showed different sensitive rate to other twelve antibiotics. The results described above may be useful in epidemiological studies as well as clinical therapy of the elderly patients with P. aeruginosa lung infections.