Vestrheim Didrik F, Steinbakk Martin, Aaberge Ingeborg S, Caugant Dominique A
Department of Bacteriology and Immunology, Norwegian Institute of Public Health, Oslo, Norway.
Clin Vaccine Immunol. 2012 Mar;19(3):443-5. doi: 10.1128/CVI.05563-11. Epub 2012 Jan 11.
Serotype replacement in invasive pneumococcal disease has been observed after widespread use of the 7-valent pneumococcal conjugate vaccine (PCV7). Replacement is dominated by penicillin-nonsusceptible serotype 19A in several countries. Antibiotic selection pressure has been proposed to interact with immunization, leading to rapid replacement. In Norway, where prescription of antibiotics is limited, post-PCV7 replacement by serotype 19A is dominated by penicillin-susceptible clones. Hence, serotype 19A replacement occurs, although it is not driven by antibiotic selection pressure.
在广泛使用7价肺炎球菌结合疫苗(PCV7)后,侵袭性肺炎球菌疾病中出现了血清型替换现象。在一些国家,替换主要由对青霉素不敏感的19A血清型主导。有人提出抗生素选择压力与免疫接种相互作用,导致快速替换。在挪威,抗生素处方受到限制,PCV7接种后19A血清型的替换主要由对青霉素敏感的克隆主导。因此,尽管血清型19A的替换并非由抗生素选择压力驱动,但这种替换仍会发生。