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Pneumococcal carriage in households in Karonga District, Malawi, before and after introduction of 13-valent pneumococcal conjugate vaccination

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Pneumococcal carriage in households in Karonga District, Malawi, before and after introduction of 13-valent pneumococcal conjugate vaccination. / Heinsbroek, Ellen; Tafatatha, Terence; Phiri, Amos; Swarthout, Todd D; Alaerts, Maaike; Crampin, Amelia C; Chisambo, Christina; Mwiba, Oddie; Read, Jonathan M; French, Neil.

In: Vaccine, Vol. 36, No. 48, 19.11.2018, p. 7369-7376.

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Heinsbroek, E, Tafatatha, T, Phiri, A, Swarthout, TD, Alaerts, M, Crampin, AC, Chisambo, C, Mwiba, O, Read, JM & French, N 2018, 'Pneumococcal carriage in households in Karonga District, Malawi, before and after introduction of 13-valent pneumococcal conjugate vaccination', Vaccine, vol. 36, no. 48, pp. 7369-7376. https://doi.org/10.1016/j.vaccine.2018.10.021

APA

Heinsbroek, E., Tafatatha, T., Phiri, A., Swarthout, T. D., Alaerts, M., Crampin, A. C., ... French, N. (2018). Pneumococcal carriage in households in Karonga District, Malawi, before and after introduction of 13-valent pneumococcal conjugate vaccination. Vaccine, 36(48), 7369-7376. https://doi.org/10.1016/j.vaccine.2018.10.021

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Heinsbroek, Ellen ; Tafatatha, Terence ; Phiri, Amos ; Swarthout, Todd D ; Alaerts, Maaike ; Crampin, Amelia C ; Chisambo, Christina ; Mwiba, Oddie ; Read, Jonathan M ; French, Neil. / Pneumococcal carriage in households in Karonga District, Malawi, before and after introduction of 13-valent pneumococcal conjugate vaccination. In: Vaccine. 2018 ; Vol. 36, No. 48. pp. 7369-7376.

Bibtex

@article{3aa2e36c91c24f00823b45c43559498d,
title = "Pneumococcal carriage in households in Karonga District, Malawi, before and after introduction of 13-valent pneumococcal conjugate vaccination",
abstract = "BACKGROUND: Thirteen-valent pneumococcal conjugate vaccine (PCV13) was introduced in Malawi in November 2011 and is offered to infants at 6, 10 and 14 weeks of age as part of routine immunisation. PCV13 is expected to reduce vaccine type (VT) nasopharyngeal carriage, leading to reduced transmission and herd protection.METHODS: We compared pneumococcal carriage in rural Karonga District, Malawi, pre-vaccine in 2009-2011 and post-vaccine in 2014 using a combination of cross-sectional and longitudinal analyses. Nasopharyngeal swabs were collected from a cohort of mother-infant pairs and household members <16 years. Pneumococci from 2009 to 2011 were serogrouped using latex agglutination and serotyped by Quellung reaction. In 2014, latex agglutination was used for both steps. Carriage prevalence ratios using prevalence data from before and after vaccine introduction were calculated by log-binomial regression, adjusted for age, seasonality and household composition. Participating infants in 2014 received PCV13 as part of routine immunisation.RESULTS: VT carriage prior to PCV-13 introduction was 11.4{\%}, 45.1{\%}, 28.2{\%}, 21.2{\%} and 6.6{\%} for 6-week old infants, 18-week old infants, children 1-4 years, children 5-15 years and mothers, respectively. After vaccine introduction, VT carriage decreased among vaccinated 18-week old infants (adjusted prevalence ratio 0.24 (95{\%}CI 0.08-0.75)), vaccinated children 1-4 years (0.54 (0.33-0.88)), unvaccinated children 5-15 years (0.37 (0.17-0.78)) and mothers (0.34 (0.15-0.79)). No decrease in VT carriage was observed for 6-week old infants too young to be vaccinated (1.07 (0.38-3.02)) and PCV-13 ineligible children 1-4 years (0.84 (0.53-1.33)). Non-VT carriage increased only among vaccinated children 1-4 years (1.58 (1.21-2.06)).CONCLUSIONS: There is evidence of reduced VT pneumococcal carriage three years after vaccine introduction in this rural Malawian population with good vaccine coverage using a 3 + 0 schedule. However carriage was sustained among 6-week-old infants and PCV13 ineligible 1-4 year olds, and there was some indication of serotype replacement in vaccinated 1-4 year olds.",
keywords = "Streptococcus pneumoniae, Carriage, Infant, Africa, Cohort studies, Pneumococcal conjugate vaccine",
author = "Ellen Heinsbroek and Terence Tafatatha and Amos Phiri and Swarthout, {Todd D} and Maaike Alaerts and Crampin, {Amelia C} and Christina Chisambo and Oddie Mwiba and Read, {Jonathan M} and Neil French",
note = "Copyright {\circledC} 2018. Published by Elsevier Ltd.",
year = "2018",
month = "11",
day = "19",
doi = "10.1016/j.vaccine.2018.10.021",
language = "English",
volume = "36",
pages = "7369--7376",
journal = "Vaccine",
issn = "1873-2518",
publisher = "Elsevier BV",
number = "48",

}

RIS

TY - JOUR

T1 - Pneumococcal carriage in households in Karonga District, Malawi, before and after introduction of 13-valent pneumococcal conjugate vaccination

AU - Heinsbroek, Ellen

AU - Tafatatha, Terence

AU - Phiri, Amos

AU - Swarthout, Todd D

AU - Alaerts, Maaike

AU - Crampin, Amelia C

AU - Chisambo, Christina

AU - Mwiba, Oddie

AU - Read, Jonathan M

AU - French, Neil

N1 - Copyright © 2018. Published by Elsevier Ltd.

PY - 2018/11/19

Y1 - 2018/11/19

N2 - BACKGROUND: Thirteen-valent pneumococcal conjugate vaccine (PCV13) was introduced in Malawi in November 2011 and is offered to infants at 6, 10 and 14 weeks of age as part of routine immunisation. PCV13 is expected to reduce vaccine type (VT) nasopharyngeal carriage, leading to reduced transmission and herd protection.METHODS: We compared pneumococcal carriage in rural Karonga District, Malawi, pre-vaccine in 2009-2011 and post-vaccine in 2014 using a combination of cross-sectional and longitudinal analyses. Nasopharyngeal swabs were collected from a cohort of mother-infant pairs and household members <16 years. Pneumococci from 2009 to 2011 were serogrouped using latex agglutination and serotyped by Quellung reaction. In 2014, latex agglutination was used for both steps. Carriage prevalence ratios using prevalence data from before and after vaccine introduction were calculated by log-binomial regression, adjusted for age, seasonality and household composition. Participating infants in 2014 received PCV13 as part of routine immunisation.RESULTS: VT carriage prior to PCV-13 introduction was 11.4%, 45.1%, 28.2%, 21.2% and 6.6% for 6-week old infants, 18-week old infants, children 1-4 years, children 5-15 years and mothers, respectively. After vaccine introduction, VT carriage decreased among vaccinated 18-week old infants (adjusted prevalence ratio 0.24 (95%CI 0.08-0.75)), vaccinated children 1-4 years (0.54 (0.33-0.88)), unvaccinated children 5-15 years (0.37 (0.17-0.78)) and mothers (0.34 (0.15-0.79)). No decrease in VT carriage was observed for 6-week old infants too young to be vaccinated (1.07 (0.38-3.02)) and PCV-13 ineligible children 1-4 years (0.84 (0.53-1.33)). Non-VT carriage increased only among vaccinated children 1-4 years (1.58 (1.21-2.06)).CONCLUSIONS: There is evidence of reduced VT pneumococcal carriage three years after vaccine introduction in this rural Malawian population with good vaccine coverage using a 3 + 0 schedule. However carriage was sustained among 6-week-old infants and PCV13 ineligible 1-4 year olds, and there was some indication of serotype replacement in vaccinated 1-4 year olds.

AB - BACKGROUND: Thirteen-valent pneumococcal conjugate vaccine (PCV13) was introduced in Malawi in November 2011 and is offered to infants at 6, 10 and 14 weeks of age as part of routine immunisation. PCV13 is expected to reduce vaccine type (VT) nasopharyngeal carriage, leading to reduced transmission and herd protection.METHODS: We compared pneumococcal carriage in rural Karonga District, Malawi, pre-vaccine in 2009-2011 and post-vaccine in 2014 using a combination of cross-sectional and longitudinal analyses. Nasopharyngeal swabs were collected from a cohort of mother-infant pairs and household members <16 years. Pneumococci from 2009 to 2011 were serogrouped using latex agglutination and serotyped by Quellung reaction. In 2014, latex agglutination was used for both steps. Carriage prevalence ratios using prevalence data from before and after vaccine introduction were calculated by log-binomial regression, adjusted for age, seasonality and household composition. Participating infants in 2014 received PCV13 as part of routine immunisation.RESULTS: VT carriage prior to PCV-13 introduction was 11.4%, 45.1%, 28.2%, 21.2% and 6.6% for 6-week old infants, 18-week old infants, children 1-4 years, children 5-15 years and mothers, respectively. After vaccine introduction, VT carriage decreased among vaccinated 18-week old infants (adjusted prevalence ratio 0.24 (95%CI 0.08-0.75)), vaccinated children 1-4 years (0.54 (0.33-0.88)), unvaccinated children 5-15 years (0.37 (0.17-0.78)) and mothers (0.34 (0.15-0.79)). No decrease in VT carriage was observed for 6-week old infants too young to be vaccinated (1.07 (0.38-3.02)) and PCV-13 ineligible children 1-4 years (0.84 (0.53-1.33)). Non-VT carriage increased only among vaccinated children 1-4 years (1.58 (1.21-2.06)).CONCLUSIONS: There is evidence of reduced VT pneumococcal carriage three years after vaccine introduction in this rural Malawian population with good vaccine coverage using a 3 + 0 schedule. However carriage was sustained among 6-week-old infants and PCV13 ineligible 1-4 year olds, and there was some indication of serotype replacement in vaccinated 1-4 year olds.

KW - Streptococcus pneumoniae

KW - Carriage

KW - Infant

KW - Africa

KW - Cohort studies

KW - Pneumococcal conjugate vaccine

U2 - 10.1016/j.vaccine.2018.10.021

DO - 10.1016/j.vaccine.2018.10.021

M3 - Journal article

VL - 36

SP - 7369

EP - 7376

JO - Vaccine

JF - Vaccine

SN - 1873-2518

IS - 48

ER -