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Gonzales BE, Mercado EH, Castillo-Tokumori F, Montero AE, Luna-Muschi A, Marcelo-Ragas M, Campos F, Chaparro E, Del Águila O, Castillo ME, Saenz A, Reyes I, Hernandez R, Ochoa TJ. Pneumococcal serotypes and antibiotic resistance in healthy carriage children after introduction of PCV13 in Lima, Peru. Vaccine 2023:S0264-410X(23)00592-3. [PMID: 37270366 DOI: 10.1016/j.vaccine.2023.05.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 04/23/2023] [Accepted: 05/16/2023] [Indexed: 06/05/2023]
Abstract
OBJECTIVE To determinate the frequency of Streptococcus pneumoniae nasopharyngeal carriers, serotypes and antimicrobial resistance in healthy children in Lima, Peru, post-PCV13 introduction and to compare the results with a similar study conducted between 2006 and 2008 before PCV7 introduction (pre-PCV7). METHODS A cross-sectional multicenter study was conducted between January 2018 and August 2019 in 1000 healthy children under two years of age. We use standard microbiological methods to determinate S. pneumoniae from nasopharyngeal swab, Kirby Bauer and minimum inhibitory concentration methods to determinate antimicrobial susceptibility and whole genomic sequencing to determinate pneumococcal serotypes. RESULTS The pneumococcal carriage rate was 20.8 % vs. 31.1 % in pre-PCV7 (p < 0.001). The most frequent serotypes were 15C, 19A and 6C (12.4 %, 10.9 % and 10.9 % respectively). The carriage of PCV13 serotypes after PCV13 introduction decreased from 59.1 % (before PCV7 introduction) to 18.7 % (p < 0.001). Penicillin resistance was 75.5 %, TMP/SMX 75.5 % and azithromycin 50.0 %, using disk diffusion. Penicillin resistance rates using MIC breakpoint for meningitis (MIC ≥ 0.12) increased from 60.4 % to 74.5 % (p = 0.001). CONCLUSION The introduction of PCV13 in the immunization program in Peru has decreased the pneumococcal nasopharyngeal carriage and the frequency of PCV13 serotypes; however, there has been an increase in non-PCV13 serotypes and antimicrobial resistance.
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Affiliation(s)
- Brayan E Gonzales
- Instituto de Medicina Tropical Alexander von Humboldt, Universidad Peruana Cayetano Heredia, Lima, Peru; Grupo Peruano de Investigación en Neumococo (GPIN), Lima, Peru
| | - Erik H Mercado
- Instituto de Medicina Tropical Alexander von Humboldt, Universidad Peruana Cayetano Heredia, Lima, Peru; Grupo Peruano de Investigación en Neumococo (GPIN), Lima, Peru
| | - Franco Castillo-Tokumori
- Facultad de Medicina, Universidad Peruana Cayetano Heredia, Lima, Peru; Grupo Peruano de Investigación en Neumococo (GPIN), Lima, Peru
| | - Andrea E Montero
- Grupo Peruano de Investigación en Neumococo (GPIN), Lima, Peru; Facultad de Medicina, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Alessandra Luna-Muschi
- Facultad de Medicina, Universidad Peruana Cayetano Heredia, Lima, Peru; Grupo Peruano de Investigación en Neumococo (GPIN), Lima, Peru
| | - Madhelli Marcelo-Ragas
- Instituto de Medicina Tropical Alexander von Humboldt, Universidad Peruana Cayetano Heredia, Lima, Peru; Grupo Peruano de Investigación en Neumococo (GPIN), Lima, Peru
| | - Francisco Campos
- Grupo Peruano de Investigación en Neumococo (GPIN), Lima, Peru; Departamento de Pediatría, Hospital Nacional Docente Madre-Niño San Bartolomé, Lima, Peru
| | - Eduardo Chaparro
- Grupo Peruano de Investigación en Neumococo (GPIN), Lima, Peru; Facultad de Medicina, Universidad Peruana Cayetano Heredia, Lima, Peru; Departamento de Pediatría, Hospital Nacional Cayetano Heredia, Lima, Peru
| | - Olguita Del Águila
- Grupo Peruano de Investigación en Neumococo (GPIN), Lima, Peru; Servicio de Pediatría de Especialidades Clínicas, Hospital Nacional Edgardo Rebagliati Martins, Lima, Peru
| | - María E Castillo
- Grupo Peruano de Investigación en Neumococo (GPIN), Lima, Peru; Facultad de Medicina, Universidad Peruana Cayetano Heredia, Lima, Peru; Oficina de Epidemiología, Instituto Nacional de Salud del Niño, Lima, Peru
| | - Andrés Saenz
- Grupo Peruano de Investigación en Neumococo (GPIN), Lima, Peru; Departamento de Pediatría, Hospital Nacional Daniel Alcides Carrión, Lima, Peru
| | - Isabel Reyes
- Grupo Peruano de Investigación en Neumococo (GPIN), Lima, Peru; Servicio de Hospitalización, Hospital de Emergencias Pediátricas, Lima, Peru
| | - Roger Hernandez
- Grupo Peruano de Investigación en Neumococo (GPIN), Lima, Peru; Facultad de Medicina, Universidad Peruana Cayetano Heredia, Lima, Peru; Departamento de Pediatría, Hospital Nacional Cayetano Heredia, Lima, Peru
| | - Theresa J Ochoa
- Instituto de Medicina Tropical Alexander von Humboldt, Universidad Peruana Cayetano Heredia, Lima, Peru; Grupo Peruano de Investigación en Neumococo (GPIN), Lima, Peru; Facultad de Medicina, Universidad Peruana Cayetano Heredia, Lima, Peru.
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Al-Jumaili A, Dawood HN, Ikram D, Al-Jabban A. Pneumococcal Disease: Global Disease Prevention Strategies with a Focus on the Challenges in Iraq. Int J Gen Med 2023; 16:2095-2110. [PMID: 37275330 PMCID: PMC10237204 DOI: 10.2147/ijgm.s409476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Accepted: 05/15/2023] [Indexed: 06/07/2023] Open
Abstract
Pneumococcal disease is a global public health concern that significantly contributes to clinical disease burden and economic burden. Patients frequently afflicted are young children and older adults, as well as the immunocompromised population. Immunization is the most effective public health strategy to combat pneumococcal disease and several vaccine formulations have been developed in this regard. Although vaccines have had a significant global impact in reducing pneumococcal disease, there are several barriers to its success in Iraq. The war and conflict situation, increasing economic crises and poverty, poor vaccine accessibility in the public sector, and high vaccine costs are a few of the major obstacles that impede a successful immunization program. The last reported third dose pneumococcal conjugate vaccine coverage for Iraq was 37% in 2019, which is expected to reduce even further owing to the COVID-19 pandemic. Thus, strategies and policies to improve pneumococcal vaccine availability and coverage need to be strengthened to achieve maximum benefits of immunization. In the current review, we provide an overview of the existing knowledge on pneumococcal disease-prevention strategies across the globe. The main aim of this manuscript is to discuss the current status and challenges of pneumococcal vaccination in Iraq as well as the strategies to prevent pneumococcal infections.
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Affiliation(s)
- Ali Al-Jumaili
- Pediatric Department, Central Pediatric Teaching Hospital, Baghdad, Iraq
| | - Haider N Dawood
- Internal Medicine Department, Al-Imamain Al-Kadhimin Medical City, Baghdad, Iraq
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Thindwa D, Mwalukomo TS, Msefula J, Jambo KC, Brown C, Kamng’ona A, Mwansambo C, Ojal J, Flasche S, French N, Heyderman RS, Swarthout TD. Risk factors for pneumococcal carriage in adults living with HIV on antiretroviral therapy in the infant pneumococcal vaccine era in Malawi. AIDS 2022; 36:2045-2055. [PMID: 35983828 PMCID: PMC10503545 DOI: 10.1097/qad.0000000000003365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 08/15/2022] [Indexed: 11/25/2022]
Abstract
OBJECTIVE Adults living with HIV (ALWHIV) on antiretroviral therapy (ART) are at high risk of pneumococcal carriage and disease. To help evaluate carriage risk in African ALWHIV at least 4 years after infant pneumococcal conjugate vaccination introduction in 2011, we assessed association between pneumococcal carriage and potential risk factors. METHODS Nasopharyngeal swabs were collected from adults aged 18-40 years attending an ART clinic during rolling, cross-sectional surveys in Blantyre, Malawi between 2015 and 2019. We fitted generalized additive models to estimate the risk of sex, social economic status (SES), living with a child less than 5 years, and ART duration on carriage. RESULTS Of 2067 adults, median age was 33 years (range 28-37), 1427 (69.0%) were women, 1087 (61.4%) were in low-middle socioeconomic-status (SES), 910 (44.0%) were living with a child less than 5 years, and median ART duration was 3 years (range 0.004-17). We estimated 38.2 and 60.6% reductions in overall and vaccine-serotype carriage prevalence. Overall carriage was associated with low SES, living with a child less than 5 years and shorter duration on ART. By contrast, vaccine-type carriage was associated with living without a child less than 5 years and male sex. CONCLUSION Despite temporal reductions in overall and vaccine-serotype carriage, there is evidence of incomplete vaccine-serotype indirect protection. A targeted-vaccination campaign should be considered for ALWHIV, along with other public health measures to further reduce vaccine-serotype carriage and therefore disease.
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Affiliation(s)
- Deus Thindwa
- Centre for the Mathematical Modelling of Infectious Diseases, Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, UK
- Malawi-Liverpool-Wellcome Programme
| | - Thandie S. Mwalukomo
- School of Life Sciences and Allied Health Professions, Department of Biomedical Sciences, Kamuzu University of Health Sciences, Blantyre, Malawi
| | | | - Kondwani C. Jambo
- Malawi-Liverpool-Wellcome Programme
- Department of Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, UK
| | | | - Arox Kamng’ona
- School of Life Sciences and Allied Health Professions, Department of Biomedical Sciences, Kamuzu University of Health Sciences, Blantyre, Malawi
| | | | - John Ojal
- Centre for the Mathematical Modelling of Infectious Diseases, Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, UK
- KEMRI-Wellcome Research Programme, Geographic Medicine Centre, Kilifi, Kenya
| | - Stefan Flasche
- Centre for the Mathematical Modelling of Infectious Diseases, Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, UK
| | - Neil French
- Institute of Infection, Veterinary and Ecological Science, Department of Clinical Infection, Microbiology, and Immunology, University of Liverpool, Liverpool
| | - Robert S. Heyderman
- Division of Infection and Immunity, Research Department of Infection, NIHR Mucosal Pathogens Research Unit, University College London, London, UK
| | - Todd D. Swarthout
- Malawi-Liverpool-Wellcome Programme
- Division of Infection and Immunity, Research Department of Infection, NIHR Mucosal Pathogens Research Unit, University College London, London, UK
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Kaspar A, Mishra A, Leach A, Pifeleti S. ENT/Audiology Department of Samoa welcomes the introduction of the Pneumococcal Conjugate Vaccine (PCV) into the national childhood immunisation program. J Glob Health 2022; 12:02002. [PMID: 35567588 PMCID: PMC9107095 DOI: 10.7189/jogh.12.02002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Affiliation(s)
- Annette Kaspar
- ENT Department, Tupua Tamasese Meaole Hospital, Ministry of Health, Apia, Samoa.,Ear Health Research Program, Child Health Division, Menzies School of Health Research, Darwin, Australia
| | - Akshaya Mishra
- Expanded Program on Immunisation, UNICEF - Samoa Office, Apia, SAMOA
| | - Amanda Leach
- Ear Health Research Program, Child Health Division, Menzies School of Health Research, Darwin, Australia
| | - Sione Pifeleti
- ENT Department, Tupua Tamasese Meaole Hospital, Ministry of Health, Apia, Samoa
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Neal EFG, Chan J, Nguyen CD, Russell FM. Factors associated with pneumococcal nasopharyngeal carriage: A systematic review. PLOS GLOBAL PUBLIC HEALTH 2022; 2:e0000327. [PMID: 36962225 PMCID: PMC10021834 DOI: 10.1371/journal.pgph.0000327] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 03/14/2022] [Indexed: 11/19/2022]
Abstract
Pneumococcal disease is a major contributor to global childhood morbidity and mortality and is more common in low- and middle-income countries (LMICs) than in high-income countries. Pneumococcal carriage is a prerequisite for pneumococcal disease. Pneumococcal conjugate vaccine reduces vaccine-type carriage and disease. However, pneumococcal carriage and disease persist, and it is important to identify other potentially modifiable factors associated with pneumococcal carriage and determine if risk factors differ between low, middle, and high-income countries. This information may help inform pneumococcal disease prevention programs. This systematic literature review describes factors associated with pneumococcal carriage stratified by country income status and summarises pneumococcal carriage rates for included studies. We undertook a systematic search of English-language pneumococcal nasopharyngeal carriage studies up to 30th June 2021. Peer-reviewed studies reporting factors associated with overall pneumococcal nasopharyngeal carriage in healthy, community-based study populations were eligible for inclusion. Two researchers independently reviewed studies to determine eligibility. Results are presented as narrative summaries. This review is registered with PROSPERO, CRD42020186914. Eighty-two studies were included, and 46 (56%) were conducted in LMICs. There was heterogeneity in the factors assessed in each study. Factors positively associated with pneumococcal carriage in all income classification were young age, ethnicity, symptoms of respiratory tract infection, childcare attendance, living with young children, poverty, exposure to smoke, season, and co-colonisation with other pathogens. Breastfeeding and antibiotic use were protective against carriage in all income classifications. Median (interquartile range) pneumococcal carriage rates differed by income classification, ranging from 51% (19.3-70.2%), 38.5% (19.3-51.6%), 31.5% (19.0-51.0%), 28.5% (16.8-35.4%), (P = 0.005) in low-, lower-middle, upper-middle, and high-income classifications, respectively. Our findings suggest that where measured, factors associated with pneumococcal nasopharyngeal carriage are similar across income classifications, despite the highest pneumococcal carriage rates being in low-income classifications. Reducing viral transmission through vaccination and public health interventions to address social determinants of health would play an important role.
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Affiliation(s)
- Eleanor Frances Georgina Neal
- Infection & Immunity, Murdoch Children’s Research Institute, Royal Children’s Hospital, Parkville, VIC, Australia
- Department of Paediatrics, The University of Melbourne, Parkville, Australia
| | - Jocelyn Chan
- Infection & Immunity, Murdoch Children’s Research Institute, Royal Children’s Hospital, Parkville, VIC, Australia
- Department of Paediatrics, The University of Melbourne, Parkville, Australia
| | - Cattram Duong Nguyen
- Infection & Immunity, Murdoch Children’s Research Institute, Royal Children’s Hospital, Parkville, VIC, Australia
- Department of Paediatrics, The University of Melbourne, Parkville, Australia
| | - Fiona Mary Russell
- Infection & Immunity, Murdoch Children’s Research Institute, Royal Children’s Hospital, Parkville, VIC, Australia
- Department of Paediatrics, The University of Melbourne, Parkville, Australia
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von Mollendorf C, Ulziibayar M, Gessner BD, Do LAH, Nguyen CD, Beavon R, Suuri B, Luvsantseren D, Narangerel D, Jenney A, Dunne EM, Satzke C, Darmaa B, Mungun T, Mulholland EK. Evaluation of the impact of childhood 13-valent pneumococcal conjugate vaccine introduction on adult pneumonia in Ulaanbaatar, Mongolia: study protocol for an observational study. BMC Public Health 2021; 21:1731. [PMID: 34556065 PMCID: PMC8460191 DOI: 10.1186/s12889-021-11776-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 09/13/2021] [Indexed: 11/08/2022] Open
Abstract
BACKGROUND Community-acquired pneumonia is an important cause of morbidity and mortality in adults. Approximately one-third of pneumonia cases can be attributed to the pneumococcus. Pneumococcal conjugate vaccines (PCVs) protect against colonisation with vaccine-type serotypes. The resulting decrease in transmission of vaccine serotypes leads to large indirect effects. There are limited data from developing countries demonstrating the impact of childhood PCV immunisation on adult pneumonia. There are also insufficient data available on the burden and severity of all-cause pneumonia and respiratory syncytial virus (RSV) in adults from low resource countries. There is currently no recommendation for adult pneumococcal vaccination with either pneumococcal polysaccharide vaccine or PCVs in Mongolia. We describe the protocol developed to evaluate the association between childhood 13-valent PCV (PCV13) vaccination and trends in adult pneumonia. METHODS PCV13 was introduced into the routine childhood immunisation schedule in Mongolia in a phased manner from 2016. In March 2019 we initiated active hospital-based surveillance for adult pneumonia, with the primary objective of evaluating trends in severe hospitalised clinical pneumonia incidence in adults 18 years and older in four districts of Ulaanbaatar. Secondary objectives include measuring the association between PCV13 introduction and trends in all clinically-defined pneumonia, radiologically-confirmed pneumonia, nasopharyngeal carriage of S. pneumoniae and pneumonia associated with RSV or influenza. Clinical questionnaires, nasopharyngeal swabs, urine samples and chest radiographs were collected from enrolled patients. Retrospective administrative and clinical data were collected for all respiratory disease-related admissions from January 2015 to February 2019. DISCUSSION Establishing a robust adult surveillance system may be an important component of monitoring the indirect impact of PCVs within a country. Monitoring indirect impact of childhood PCV13 vaccination on adult pneumonia provides additional data on the full public health impact of the vaccine, which has implications for vaccine efficiency and cost-effectiveness. Adult surveillance in Mongolia will contribute to the limited evidence available on the burden of pneumococcal pneumonia among adults in low- and middle-income countries, particularly in the Asia-Pacific region. In addition, it is one of the few examples of implementing prospective, population-based pneumonia surveillance to evaluate the indirect impact of PCVs in a resource-limited setting.
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Affiliation(s)
- Claire von Mollendorf
- Infection and Immunity, New Vaccines Research Group, Murdoch Children's Research Institute, Royal Children's Hospital, 50 Flemington Road, Parkville, VIC, 3052, Australia.
- Department of Paediatrics, The University of Melbourne, Parkville, Australia.
| | - Mukhchuluun Ulziibayar
- National Center for Communicable Diseases (NCCD), Ministry of Health, Ulaanbaatar, Mongolia
| | | | - Lien Anh Ha Do
- Infection and Immunity, New Vaccines Research Group, Murdoch Children's Research Institute, Royal Children's Hospital, 50 Flemington Road, Parkville, VIC, 3052, Australia
- Department of Paediatrics, The University of Melbourne, Parkville, Australia
| | - Cattram D Nguyen
- Infection and Immunity, New Vaccines Research Group, Murdoch Children's Research Institute, Royal Children's Hospital, 50 Flemington Road, Parkville, VIC, 3052, Australia
- Department of Paediatrics, The University of Melbourne, Parkville, Australia
| | | | - Bujinlkham Suuri
- National Center for Communicable Diseases (NCCD), Ministry of Health, Ulaanbaatar, Mongolia
| | | | | | - Adam Jenney
- Infection and Immunity, New Vaccines Research Group, Murdoch Children's Research Institute, Royal Children's Hospital, 50 Flemington Road, Parkville, VIC, 3052, Australia
- Department of Infectious Diseases, The Alfred Hospital, Monash University, Melbourne, Australia
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Eileen M Dunne
- Infection and Immunity, New Vaccines Research Group, Murdoch Children's Research Institute, Royal Children's Hospital, 50 Flemington Road, Parkville, VIC, 3052, Australia
- Department of Paediatrics, The University of Melbourne, Parkville, Australia
- Pfizer Vaccines, Collegeville, PA, USA
| | - Catherine Satzke
- Infection and Immunity, New Vaccines Research Group, Murdoch Children's Research Institute, Royal Children's Hospital, 50 Flemington Road, Parkville, VIC, 3052, Australia
- Department of Paediatrics, The University of Melbourne, Parkville, Australia
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Badarchiin Darmaa
- National Center for Communicable Diseases (NCCD), Ministry of Health, Ulaanbaatar, Mongolia
| | - Tuya Mungun
- National Center for Communicable Diseases (NCCD), Ministry of Health, Ulaanbaatar, Mongolia
| | - E Kim Mulholland
- Infection and Immunity, New Vaccines Research Group, Murdoch Children's Research Institute, Royal Children's Hospital, 50 Flemington Road, Parkville, VIC, 3052, Australia
- Department of Paediatrics, The University of Melbourne, Parkville, Australia
- Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, UK
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Carriage of Streptococcus pneumoniae in children under five years of age prior to pneumococcal vaccine introduction in Southeast Asia: A systematic review and meta-analysis (2001-2019). JOURNAL OF MICROBIOLOGY, IMMUNOLOGY, AND INFECTION = WEI MIAN YU GAN RAN ZA ZHI 2021; 55:6-17. [PMID: 34511388 DOI: 10.1016/j.jmii.2021.08.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 07/11/2021] [Accepted: 08/16/2021] [Indexed: 11/21/2022]
Abstract
A number of pneumococcal carriage studies in children have been conducted in recent years. However, summary data of carriage prevalence and serotype distribution from South East Asia Region (SEAR) are limited. This may lead to the misconception that Streptococcus pneumoniae vaccine-types are uncommon in the region. Systematic reviews of pneumococcal carriage and the distribution of serotypes are critically important for evidence-based decision-making. We aimed to summarize published data on the serotype prevalence of S. pneumoniae carried in the nasopharynx of children under 5 years of age in SEAR. We performed a systematic review and meta-analysis for relevant studies on S. pneumoniae carriage conducted prior to PCV program implementation from online journal databases published between January 2001 to December 2019. The pooled prevalence of S. pneumoniae in healthy children under 5 years of age in SEAR was 36.0% (95% CI 34.2%-37.8%), and ranged from 68.0% (95% CI: 61.9%-74.0%) in Cambodia to 7.6% (95% CI: 5.7%-9.6%) in Malaysia. Serotypes 6A/B, 23F and 19F were the most common serotypes in children <5 years, accounting for 12.9% (95% CI: 9.4%-16.3%), 9.3% (95% CI: 5.9%-12.8%) and 10.1% (95% CI: 6.6%-13.5%) of isolates, respectively. Vaccine policy makers should take these results into account when making decisions on pneumococcal conjugate vaccine programs implementation. Given the paucity of data, collection of more extensive and updated information of S. pneumoniae serotype epidemiology in children under five years in SEAR is also very important for future studies.
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Nisar MI, Ahmed S, Jehan F, Shahid S, Shakoor S, Kabir F, Hotwani A, Munir S, Muhammad S, Khalid F, Althouse B, Hu H, Whitney C, Ali A, Zaidi AKM, Omer SB, Iqbal N. Direct and indirect effect of 10 valent pneumococcal vaccine on nasopharyngeal carriage in children under 2 years of age in Matiari, Pakistan. Vaccine 2021; 39:1319-1327. [PMID: 33422379 PMCID: PMC7910277 DOI: 10.1016/j.vaccine.2020.12.066] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 12/21/2020] [Accepted: 12/22/2020] [Indexed: 12/26/2022]
Abstract
Background Pakistan introduced Ten-valent pneumococcal-conjugate-vaccine PCV10 in 2012 as a 3 + 0 schedule without catch-up. Methods Children <2 years old in Matiari, Sindh provided nasopharyngeal swabs between 2014 and 2018, which were cultured for pneumococcus and serotyped through multiplex PCR at the Aga Khan University Hospital. Carriage rates over time for Vaccine-Type (VT) and Non-VT (NVT) serotypes were used to estimate direct, indirect, total and overall effects of vaccination. Regression analysis was used to determine factors associated with VT carriage. Results Pneumococcus was detected in 2370/3140 (75%). VT carriage decreased overall, 16.1–9.6% (p-trend <0.001); vaccinated (all 3 doses of PCV10 received) 11.3–8.1% (p-trend 0.031) and unvaccinated (no PCV10 dose received) 17.4–10.3% (p-trend 0.003) with a decline in serotypes 6B, 9V/9A and 19F. Immunization increased from 41.0% to 68.4% (p-trend 0.001). Direct effect of vaccine was 32.8% (95% CI 14.7–47.0%) and indirect effect 44.6%(95% CI 40.6–48.6%). Factors associated with decreased VT colonization were education 1–5 years (aOR 0.7, 95%CI 0.6–1.0), history of difficulty breathing (aOR 0.7, 95%CI 0.5–1.0), exposure to smoke (aOR 0.8, 95% CI 0.6–1.0), child fully immunized (aOR 0.7, 95%CI 0.5–1.0) and enrolled in 3rd (aOR 0.6, 95%CI 0.4–0.8) and 4th (aOR 0.6, 95%CI 0.5–0.9) year of the study whereas history of runny nose (aOR 1.5, 95% CI 1.2–1.9) was positively associated. Conclusions Decrease in VT pneumococcal carriage in vaccinated and unvaccinated children indicates herd immunity. Sustained increase in vaccine coverage and close long-term surveillance is warranted.
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Affiliation(s)
- Muhammad Imran Nisar
- Department of Pediatric and Child Health, Aga Khan University, Karachi, Pakistan.
| | - Sheraz Ahmed
- Department of Pediatric and Child Health, Aga Khan University, Karachi, Pakistan
| | - Fyezah Jehan
- Department of Pediatric and Child Health, Aga Khan University, Karachi, Pakistan
| | - Shahira Shahid
- Department of Pediatric and Child Health, Aga Khan University, Karachi, Pakistan
| | - Sadia Shakoor
- Department of Pathology and Laboratory Medicine, Aga Khan University, Karachi, Pakistan
| | - Furqan Kabir
- Department of Pediatric and Child Health, Aga Khan University, Karachi, Pakistan
| | - Aneeta Hotwani
- Department of Pediatric and Child Health, Aga Khan University, Karachi, Pakistan
| | - Sahrish Munir
- Department of Pediatric and Child Health, Aga Khan University, Karachi, Pakistan
| | - Sajid Muhammad
- Department of Pediatric and Child Health, Aga Khan University, Karachi, Pakistan
| | - Farah Khalid
- Department of Pediatric and Child Health, Aga Khan University, Karachi, Pakistan
| | | | - Hao Hu
- Bill & Melinda Gates Foundation, Seattle, WA, USA
| | | | - Asad Ali
- Department of Pediatric and Child Health, Aga Khan University, Karachi, Pakistan
| | - Anita K M Zaidi
- Department of Pediatric and Child Health, Aga Khan University, Karachi, Pakistan; Bill & Melinda Gates Foundation, Seattle, WA, USA
| | - Saad B Omer
- Yale Institute for Global Health, New Haven, CT, USA
| | - Najeeha Iqbal
- Department of Pediatric and Child Health, Aga Khan University, Karachi, Pakistan
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Ekinci E, Desmet S, Van Heirstraeten L, Mertens C, Wouters I, Beutels P, Verhaegen J, Malhotra-Kumar S, Theeten H. Streptococcus pneumoniae Serotypes Carried by Young Children and Their Association With Acute Otitis Media During the Period 2016-2019. Front Pediatr 2021; 9:664083. [PMID: 34291017 PMCID: PMC8286995 DOI: 10.3389/fped.2021.664083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Accepted: 06/07/2021] [Indexed: 11/13/2022] Open
Abstract
Background: Streptococcus pneumoniae (Sp) is a major cause of acute otitis media (AOM). Pneumococcal conjugate vaccine (PCV) programs have altered pneumococcal serotype epidemiology in disease and carriage. In this study, we used samples collected during a cross-sectional study to examine if the clinical picture of acute otitis media (AOM) in young children exposed to the PCV program in Belgium was related to the carried pneumococcal strains, and if their carriage profile differed from healthy children attending daycare centers. Material/Methods: In three collection periods from February 2016 to May 2018, nasopharyngeal swabs and background characteristics were collected from children aged 6-30 months either presenting at their physician with AOM (AOM-group) or healthy and attending day care (DCC-group). Clinical signs of AOM episodes and treatment schedule were registered by the physicians. Sp was detected, quantified, and characterized using both conventional culture analysis and real-time PCR analysis. Results: Among 3,264 collected samples, overall pneumococcal carriage and density were found at similar rates in both AOM and DCC. As expected non-vaccine serotypes were most frequent: 23B (AOM: 12.3%; DCC: 17.4%), 11A (AOM: 7.5%; DCC: 7.4%) and 15B (AOM: 7.5%; DCC: 7.1%). Serotypes 3, 6C, 7B, 9N, 12F, 17F, and 29 were more often found in AOM than in DCC (p-value < 0.05), whereas 23A and 23B were less often present in AOM (p-value < 0.05). Antibiotic non-susceptibility of Sp strains was similar in both groups. No predictors of AOM severity were identified. Conclusion: In the present study, overall carriage prevalence and density of S. pneumoniae were found similar in young children with AOM and in healthy children attending day-care centers in Belgium. Certain serotypes not currently included in the PCV vaccines were found to be carried more often in children with AOM than in DCC, a finding that might suggest a relationship between these serotypes and AOM.
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Affiliation(s)
- Esra Ekinci
- Centre for Evaluation of Vaccination, Vaccine and Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
| | - Stefanie Desmet
- Reference Centre for Pneumococci, University Hospitals Leuven, Leuven, Belgium
| | - Liesbet Van Heirstraeten
- Laboratory of Medical Microbiology, Vaccine and Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
| | - Colette Mertens
- Centre for Evaluation of Vaccination, Vaccine and Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
| | - Ine Wouters
- Centre for Evaluation of Vaccination, Vaccine and Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
| | - Philippe Beutels
- Centre for Health Economics Research and Modelling Infectious Diseases, University of Antwerp, Antwerp, Belgium
| | - Jan Verhaegen
- Reference Centre for Pneumococci, University Hospitals Leuven, Leuven, Belgium
| | - Surbhi Malhotra-Kumar
- Laboratory of Medical Microbiology, Vaccine and Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
| | - Heidi Theeten
- Centre for Evaluation of Vaccination, Vaccine and Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
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Saketa ST, Merilles OE, Bar-Zeev N. Welcome evidence of vaccine impact in the Pacific. THE LANCET REGIONAL HEALTH. WESTERN PACIFIC 2021; 6:100068. [PMID: 34327403 PMCID: PMC8315450 DOI: 10.1016/j.lanwpc.2020.100068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 11/24/2020] [Indexed: 11/21/2022]
Affiliation(s)
- Salanieta T Saketa
- Surveillance, Preparedness and Response Programme, Pacific Community, Fiji
| | | | - Naor Bar-Zeev
- International Vaccine Access Center, Johns Hopkins University Bloomberg School of Public Health, USA
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