scholarly journals Pneumococcal conjugate vaccine coverage and indirect protection against invasive pneumococcal disease and pneumonia hospitalisations in Australia: a retrospective record linkage cohort study

2021 ◽  
Author(s):  
Jocelyn Chan ◽  
Heather Gidding ◽  
Christopher Blyth ◽  
Parveen Fathima ◽  
Sanjay Jayasinghe ◽  
...  
Keyword(s):  
Invasive Pneumococcal Disease ◽  
Pneumococcal Disease ◽  
Vaccine Coverage ◽  
A Priori ◽  
Indigenous Populations ◽  
P Value ◽  
Loss To Follow Up ◽  
South Wales ◽  
Urban Rural ◽  
Indirect Protection

Background: There is limited empiric evidence on the coverage of pneumococcal conjugate vaccines (PCV) required to generate substantial indirect protection. We investigate the association between population PCV coverage and indirect protection against invasive pneumococcal disease (IPD) and pneumonia hospitalisations among under-vaccinated Australian children. Methods: Birth and vaccination records, IPD notifications and hospitalisations were individually linked for children aged < five years, born between 2001 and 2012 in two Australian states (New South Wales and Western Australia; 1.37 million children). Using Poisson regression models, we examined the association between PCV coverage, in small geographical units, and the incidence of (1) 7-valent PCV (PCV7)-type IPD, (2) all-cause pneumonia and (3) pneumococcal and lobar pneumonia hospitalisation in under-vaccinated children. Under-vaccinated children received < two doses of PCV at < 12 months of age and no doses at ≥ 12 months of age. Potential confounding variables were selected for adjustment a priori with the assistance of a directed acyclic graph. The main limitations of this study include the potential for differential loss to follow-up, geographical misclassification of children (based on addressed at birth only) and unmeasured confounders. Findings There were strong inverse associations between PCV coverage and the incidence of PCV7-type IPD (adjusted incidence rate ratio [aIRR] 0.967, 95% CI 0.958-0.975, p-value <0.001), and pneumonia hospitalisations (all-cause pneumonia: aIRR 0.991 95% CI 0.990-0.994, p-value<0.001) among under-vaccinated children. Subgroup analyses for children < four months old, urban, rural and Indigenous populations showed similar trends, although effects were smaller for rural and Indigenous populations. Fifty-percent coverage of PCV7 among children < five years of age prevented up to 72.5% (95% CI 51.6-84.4) of PCV7-type IPD among under-vaccinated children, while 90% coverage prevented 95.2% (95% CI 89.4-97.8). Conclusions In this study we observed substantial indirect protection at low PCV coverage, challenging assumptions high vaccine coverage is required.

scholarly journals Levels of pneumococcal conjugate vaccine coverage and indirect protection against invasive pneumococcal disease and pneumonia hospitalisations in Australia: An observational study

PLoS Medicine ◽  
2021 ◽  
Vol 18 (8) ◽  
pp. e1003733
Author(s):  
Jocelyn Chan ◽  
Heather F. Gidding ◽  
Christopher C. Blyth ◽  
Parveen Fathima ◽  
Sanjay Jayasinghe ◽  
...  
Keyword(s):  
Invasive Pneumococcal Disease ◽  
Pneumococcal Disease ◽  
Vaccine Coverage ◽  
A Priori ◽  
Indigenous Populations ◽  
South Wales ◽  
Vaccine Type ◽  
Urban Rural ◽  
Program Costs ◽  
Indirect Protection

Background There is limited empiric evidence on the coverage of pneumococcal conjugate vaccines (PCVs) required to generate substantial indirect protection. We investigate the association between population PCV coverage and indirect protection against invasive pneumococcal disease (IPD) and pneumonia hospitalisations among undervaccinated Australian children. Methods and findings Birth and vaccination records, IPD notifications, and hospitalisations were individually linked for children aged <5 years, born between 2001 and 2012 in 2 Australian states (New South Wales and Western Australia; 1.37 million children). Using Poisson regression models, we examined the association between PCV coverage, in small geographical units, and the incidence of (1) 7-valent PCV (PCV7)-type IPD; (2) all-cause pneumonia; and (3) pneumococcal and lobar pneumonia hospitalisation in undervaccinated children. Undervaccinated children received <2 doses of PCV at <12 months of age and no doses at ≥12 months of age. Potential confounding variables were selected for adjustment a priori with the assistance of a directed acyclic graph. There were strong inverse associations between PCV coverage and the incidence of PCV7-type IPD (adjusted incidence rate ratio [aIRR] 0.967, 95% confidence interval [CI] 0.958 to 0.975, p-value < 0.001), and pneumonia hospitalisations (all-cause pneumonia: aIRR 0.991 95% CI 0.990 to 0.994, p-value < 0.001) among undervaccinated children. Subgroup analyses for children <4 months old, urban, rural, and Indigenous populations showed similar trends, although effects were smaller for rural and Indigenous populations. Approximately 50% coverage of PCV7 among children <5 years of age was estimated to prevent up to 72.5% (95% CI 51.6 to 84.4) of PCV7-type IPD among undervaccinated children, while 90% coverage was estimated to prevent 95.2% (95% CI 89.4 to 97.8). The main limitations of this study include the potential for differential loss to follow-up, geographical misclassification of children (based on residential address at birth only), and unmeasured confounders. Conclusions In this study, we observed substantial indirect protection at lower levels of PCV coverage than previously described—challenging assumptions that high levels of PCV coverage (i.e., greater than 90%) are required. Understanding the association between PCV coverage and indirect protection is a priority since the control of vaccine-type pneumococcal disease is a prerequisite for reducing the number of PCV doses (from 3 to 2). Reduced dose schedules have the potential to substantially reduce program costs while maintaining vaccine impact.

scholarly journals 2711. Effectiveness of 13-Valent Pneumococcal Conjugate Vaccine Against Invasive Pneumococcal Disease in Older Adults

2019 ◽  
Vol 6 (Supplement_2) ◽  
pp. S953-S954
Author(s):  
Ned Lewis ◽  
Amber Hsiao ◽  
John Hansen ◽  
Arnold Yee ◽  
Charlie Chao ◽  
...  
Keyword(s):  
Conjugate Vaccine ◽  
Invasive Pneumococcal Disease ◽  
Pneumococcal Conjugate Vaccine ◽  
Pneumococcal Disease ◽  
Vaccine Coverage ◽  
Conditional Logistic Regression ◽  
Population Level ◽  
P Value ◽  
Kaiser Permanente ◽  
Vaccine Type

Abstract Background Routine use of 13-valent pneumococcal conjugate vaccine (PCV13) has been recommended for infants since early 2010 and for adults ≥65 years since 2014 when KPNC began routine use of PCV13 in adults. PCV13 vaccine effectiveness (VE) against vaccine-type invasive pneumococcal disease (IPD) has been demonstrated; however, recent surveillance data have been interpreted as showing limited population-level impact of PCV13 on serotype 3 IPD. We estimated PCV13 VE against IPD due to vaccine serotypes at Kaiser Permanente Northern California (KPNC). Methods The study period spanned September 2014 through September 2018. The cohort included KPNC members who were aged ≥65 years with no record of pneumococcal polysaccharide vaccine (PPV23) receipt before age 65 years. We compared IPD cases with KPNC members who were the same age on the date of the positive pneumococcal culture using conditional logistic regression, conditioned on age and date, and controlled for sex, race, KPNC service area and membership history, prior season influenza vaccine receipt, PPV23 receipt after age 65 years, risk factors for IPD, and healthcare utilization. Results From September 2014 to September 2018, PCV13 vaccine coverage among persons ≥65 years old increased from < 1% to 77%. During the same period, there was a total of 245 IPD cases. For a variety of reasons, we did not have serotype results for 57 (23%) IPD cases, which were excluded from the analysis. There were 61 (25%) PCV13-type IPD cases included in the analysis, of which 33 (14%) were serotype 3. PCV13 VE against PCV13-type serotypes was 68.0% (95% CI: 37.7%, 83.6%; P-value < 0.01), and 53.4% (95% CI: −10.0%, 80.3%; P = 0.08) against serotype 3. Conclusion During the first 4 years of PCV13 vaccination implementation in adults ≥65 years of age at KPNC, PCV13 provided significant protection against PCV13-type IPD. Further surveillance will allow for more precise estimation of PCV13 VE on overall and serotype 3 IPD over time. Disclosures All authors: No reported disclosures.

Epidemiology of invasive pneumococcal disease in urban New South Wales, 1997–1999

2000 ◽  
Vol 173 (S2) ◽  
Author(s):  
Peter B McIntyre ◽  
Robin E Gilmour ◽  
Gwendolyn L Gilbert ◽  
Alyson M Kakakios ◽  
Craig M Mellis
Keyword(s):  
Invasive Pneumococcal Disease ◽  
Pneumococcal Disease ◽  
New South ◽  
New South Wales ◽  
South Wales

Invasive Pneumococcal Disease Caused by Nonvaccine Serotypes Among Alaska Native Children With High Levels of 7-Valent Pneumococcal Conjugate Vaccine Coverage

JAMA ◽  
2007 ◽  
Vol 297 (16) ◽  
pp. 1784 ◽  
Author(s):  
Rosalyn J. Singleton ◽  
Thomas W. Hennessy ◽  
Lisa R. Bulkow ◽  
Laura L. Hammitt ◽  
Tammy Zulz ◽  
...  
Keyword(s):  
Conjugate Vaccine ◽  
Invasive Pneumococcal Disease ◽  
Alaska Native ◽  
Pneumococcal Conjugate Vaccine ◽  
Pneumococcal Disease ◽  
Vaccine Coverage

Laboratory surveillance of invasive pneumococcal disease in New South Wales, Australia, before and after introduction of 7-valent conjugate vaccine: reduced disease, but not antibiotic resistance rates

2012 ◽  
Vol 141 (9) ◽  
pp. 1797-1806 ◽  
Author(s):  
S. OFTADEH ◽  
H. F. GIDDING ◽  
G. L. GILBERT
Keyword(s):  
Conjugate Vaccine ◽  
Invasive Pneumococcal Disease ◽  
Pneumococcal Disease ◽  
New South ◽  
New South Wales ◽  
Annual Number ◽  
Age Group ◽  
Erythromycin Resistance ◽  
South Wales ◽  
Laboratory Surveillance

SUMMARYWe compared serotype distributions ofStreptococcus pneumoniaeisolates from patients aged <5 and ⩾5 years with invasive pneumococcal disease in New South Wales, Australia, and antibiotic susceptibilities of isolates from the <5 years age group only, before (2002–2004) and after (2005–2009) introduction of the 7-valent pneumococcal conjugate vaccine (PCV7). Overall, there were significant decreases in the mean annual number of referred isolates (770vs. 515) and the proportion belonging to PCV7 serotypes (74%vs. 38%), but non-PCV7 serotypes, particularly 19A, increased (5%vs. 18%). All changes were more marked in the <5 years age group. Susceptibility testing of isolates from the <5 years age group showed variation in resistance between serotypes, but significant overall increases in penicillin non-susceptibility (23%vs. 31%), ceftriaxone resistance (2%vs. 12%) and multidrug resistance (4%vs. 7%) rates; erythromycin resistance fell (32%vs. 25%). Continued surveillance is needed to monitor changes following the introduction of 13-valent PCV in 2012.

scholarly journals The Impact of Pneumococcal Conjugate Vaccine (PCV) Coverage Heterogeneities on the Changing Epidemiology of Invasive Pneumococcal Disease in Switzerland, 2005–2019

2021 ◽  
Vol 9 (5) ◽  
pp. 1078
Author(s):  
Oluwaseun Rume-Abiola Oyewole ◽  
Phung Lang ◽  
Werner C. Albrich ◽  
Kerstin Wissel ◽  
Stephen L. Leib ◽  
...  
Keyword(s):  
Invasive Pneumococcal Disease ◽  
Pneumococcal Disease ◽  
Vaccine Coverage ◽  
Age Groups ◽  
Nationwide Survey ◽  
Vaccine Uptake ◽  
Dependent Manner ◽  
Beneficial Effects ◽  
Vaccine Type ◽  
The Impact

Pneumococcal conjugate vaccines (PCVs) have lowered the incidence of invasive pneumococcal disease (IPD) worldwide. However, the influence of regional vaccine uptake differences on the changing epidemiology of IPD remains unclear. We aimed to examine the overall impact of both seven- and 13-valent PCVs (PCV7 and PCV13) on IPD in Switzerland. Three-year periods from 2005–2010 and 2011–2019 were considered, respectively, as (early and late) PCV7 eras and (early, mid and late) PCV13 eras. Vaccine coverage was estimated from a nationwide survey according to east (German-speaking) and west (French/Italian-speaking) regions for each period. Reported incidence rate ratios (IRRs) were compared between successive periods and regions using nationwide IPD surveillance data. Overall IPD incidence across all ages was only 16% lower in the late PCV13 era compared to the early PCV7 era (IRR 0.83, 95% CI 0.79–0.88), due to increasing incidence of non-PCV-type IPD (2.59, 2.37–2.83) in all age groups, except children <5 years. PCV uptake rates in swiss children were slightly higher in the west than the east (p < 0.001), and were accompanied by lower IPD incidences across all age groups in the former region. Post-PCV13, non-PCV serotypes 8, 22F and 9N were the major cause of IPD in adults ≥65 years. Increased PCV coverage in both areas of Switzerland resulted in a decrease in vaccine-type and overall IPD incidence across all age groups, in a regionally dependent manner. However, the rising incidence of non-vaccine-type IPD, exclusive to older adults, may undermine indirect beneficial effects.

scholarly journals Impact of vaccination on invasive pneumococcal disease in Italy 2007–2017: surveillance challenges and epidemiological changes

2020 ◽  
Vol 148 ◽  
Author(s):  
R. Monali ◽  
E. De Vita ◽  
F. Mariottini ◽  
G. Privitera ◽  
P. L. Lopalco ◽  
...  
Keyword(s):  
Invasive Pneumococcal Disease ◽  
Surveillance System ◽  
Pneumococcal Disease ◽  
Vaccine Coverage ◽  
National Level ◽  
Pneumococcal Vaccination ◽  
Childhood Vaccination ◽  
Annual Reports ◽  
Notification Rate ◽  
The Impact

Abstract Surveillance of new cases of invasive pneumococcal disease (IPD) in Italy was started in 2007 by the Ministry of Health (MoH). In 2012, pneumococcal childhood vaccination was introduced at the national level and, in 2017, for citizens aged 65 years and over. We describe here IPD epidemiology in Italy over the past 10 years investigating the impact of the vaccine programme on disease burden. Reports of IPD cases, data on serotype and vaccination coverage (VC) data were obtained from MoH annual reports, for the period 2007–2017. IPD notification rate and proportion by year, region, age and serotype were calculated. In 2007, 525 cases were reported (rate 0.88/100 000), rising to 1703 cases (rate 2.82/100 000) in 2017. The distribution of IPD cases by age group over time registered the largest share among individuals aged 65 years and over. A decreasing trend in notification rate was observed among those aged 0–4 years. During the same period, the 24-month VC increased, ranging from 80.9% to 96.7% in 2017. Molecular data indicated re-emergence of PPSV23-specific serotypes and non-vaccine serotypes. We observed an increase in IPD notifications during 2007–2017, likely due to an improved surveillance system, at least in some regions, with the relative quota of IPD notifications decreasing among vaccinated children cohorts. Further strengthening of IPD surveillance system, including molecular and vaccine coverage data, would be needed to assess and inform pneumococcal vaccination strategies in Italy.

scholarly journals Serotypes and Vaccine Coverage of Streptococcus Pneumoniae Colonization in the Nasopharynx of Thai Children in Congested Areas in Chiang Mai

Pathogens ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 988
Author(s):  
Anchalee Wangirapan ◽  
Satja Issaranggoon na Ayuthaya ◽  
Wasan Katip ◽  
Nongyao Kasatpibal ◽  
Raktham Mektrirat ◽  
...  
Keyword(s):  
Streptococcus Pneumoniae ◽  
High Risk ◽  
Invasive Pneumococcal Disease ◽  
Pneumococcal Disease ◽  
Vaccine Coverage ◽  
Chiang Mai ◽  
Nasopharyngeal Colonization ◽  
Conjugate Vaccines ◽  
High Risk Children ◽  
Congested Areas

Streptococcus pneumoniae causes around 10% of all deaths in children younger than five years of age. This study aimed to examine the serogroups/serotypes of S. pneumoniae colonization and vaccine serotype coverage of this organism among Thai children. Nasopharyngeal swabs of children less than or equal to 15 years of age were obtained in congested areas in Chiang Mai from 1 February 2013 to 1 August 2013. The serotyping of S. pneumoniae isolates was performed using the ImmuLex™ kit and the vaccine serotype coverage for this organism was evaluated. A total of 292 children were enrolled. One hundred and thirty children (44.5%) had nasopharyngeal colonization with Streptococcus pneumoniae. Eighty-seven (66.9%) isolates were from children younger than five years of age, seventeen (13.1%) were from children aged 6–10 years, and twenty-six (20%) were from children aged 11–15 years. The five most common serogroups/serotypes isolated were 6 (6A, 6B, 6C) (46.1%), 23 (23F, 23A, 23B) (14.6%), 19 (19F, 19A, 19B, 19C) (8.5%), 15 (15F, 15A, 15B, 15C) (6.9%), and 14 (6.1%). Vaccine serotype coverages in pneumococcal conjugate vaccines (PCV):PCV7, PCV10, and PCV13 were 79.1%, 83.6%, and 85.9%, respectively. There were significant increases in coverage between PCV7 and PCV10 (from 79.1% to 83.6%, p < 0.001), PCV7 and PCV13 (from 79.1% to 85.9%, p < 0.001), and PCV10 and PCV13 (from 83.6% to 85.9%, p < 0.001). The majority of pneumococcal serogroup/serotype colonization in the nasopharynx of Thai children in the studied areas was included in the current licensed pneumococcal conjugated vaccines (PCVs). PCV vaccination should be considered for high-risk children to reduce the incidence of invasive pneumococcal disease among Thai children.

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