Impact of pneumococcal vaccination in Denmark during the first 3 years after PCV introduction in the childhood immunization programme

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• 作者：Helene Ingels^a ; ^HIG@ssi.dk ; ^{helene_ingels@yahoo.dk} ; Jeppe Rasmussen^b ; Peter Henrik Andersen^b ; Zitta B. Harboe^a ; Steffen Glismann^b ; Helle Konradsen^a ; Steen Hoffmann^a ; Palle Valentiner-Branth^b ; Lotte Lambertsen^a ; On behalf of Danish Pneumococcal Surveillance Collaboration Group 2009&ndash ; 2010¹
• 关键词：CI ; confidence interval ; IPD ; invasive pneumococcal disease ; NVT ; non-vaccine serotype ; NVT-IPD ; non-vaccine serotype invasive pneumococcal disease ; NVT-PM ; non-vaccine serotype pneumococcal meningitis ; PM ; pneumococcal meningitis ; PCV7 ; 7-valent pneumoco
• 出版年：2012
• 期刊代码：89_0264410x
• 类别：imm
• 出版时间：6 June, 2012
• 卷：30
• 期：26
• 页码：3944-3950
• 文件大小：777 K

摘要

Background and aims

The 7-valent pneumococcal conjugate vaccine (PCV7) was introduced in Denmark in October 2007 in a 2 + 1 schedule with a catch-up programme for children up to 17 months of age. To assess the impact of PCV we evaluated on the whole population: (1) direct and indirect effects on incidence of invasive pneumococcal disease (IPD), (2) changes in pneumococcal serotype distribution and (3) IPD related mortality.

Methods

We compared disease incidence in pre-PCV (years 2000-2007) and PCV periods (years 2008-2010) based on national surveillance data.

Results

In children aged 0-5 years the overall incidence of IPD decreased from 26.7 to 16.3 cases per 100,000 (IRR 0.58; 95%Confidence Interval (CI) [0.48-0.69]) and case fatality declined from 1.8%(12 deaths) in the eight-year pre-PCV period to 0%(no deaths) in the three-year PCV period. In the whole population the overall incidence of IPD and of IPD caused by vaccine serotypes declined significantly from 19.5 to 17.7 and from 7.7 to 3.8 cases per 100,000 persons comparing the two periods. The incidence of IPD due to non-vaccine serotypes (NVT-IPD) increased significantly from 11.8 to 13.9 cases per 100,000 in the whole population (incidence rate ratio 1.18; 95%CI [1.12-1.24]) with predominance of the serotypes 1.7F and 19A.

Conclusions

We report a marked decline in incidence in IPD in both vaccinated and non-vaccinated age groups and a minor but statistically significant increase in incidence of IPD due to NVTs in both vaccinated and non-vaccinated groups with predominance of serotypes covered by higher valence pneumococcal conjugate vaccines.