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Phiri, Joseph, Sibale, Lusako, Mlongoti, Lukerensia, Mitole, Ndaona, Kusakala, Alice, Khwiya, Mercy, Kayembe, Thokozani, Lisimba, Edwin, Kapwata, Prosperina, Malisita, Ken, Chaguza, Chrispin, Ferreira, Daniela 
ORCID: https://orcid.org/0000-0002-0594-0902, Thindwa, Deus and Jambo, Kondwani ORCID: https://orcid.org/0000-0002-3195-2210
(2024)
'Estimating pneumococcal carriage dynamics in adults living with HIV in a mature infant pneumococcal conjugate vaccine programme in Malawi, a modelling study'. BMC Medicine, Vol 22, Issue 419.
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12916_2024_Article_3631.pdf - Published Version Available under License Creative Commons Attribution. Download (2MB) | Preview |
Abstract
Background
Adults living with human immunodeficiency virus (ALWHIV) receiving antiretroviral therapy (ART) exhibit higher pneumococcal carriage prevalence than adults without HIV (HIV-). To assess factors influencing high pneumococcal carriage in ALWHIV, we estimated pneumococcal carriage acquisition and clearance rates in a high transmission and disease-burdened setting at least 10 years after introducing infant PCV13 in routine immunisation.
Methods
We collected longitudinal nasopharyngeal swabs from individuals aged 18–45 in Blantyre, Malawi. The study group included both HIV- individuals and those living with HIV, categorised based on ART duration as either exceeding 1 year (ART > 1y) or less than 3 months (ART < 3 m). Samples were collected at baseline and then weekly for 16 visits. To detect pneumococcal carriage, we used classical culture microbiology, and to determine pneumococcal serotypes, we used latex agglutination. We modelled trajectories of serotype colonisation using multi-state Markov models to capture pneumococcal carriage dynamics, adjusting for age, sex, number of under 5 year old (< 5y) children, social economic status (SES), and seasonality.
Results
We enrolled 195 adults, 65 adults in each of the study groups. 51.8% were females, 25.6% lived with more than one child under 5 years old, and 41.6% lived in low socioeconomic areas. The median age was 33 years (IQR 25–37 years). The baseline pneumococcal carriage prevalence of all serotypes was 31.3%, with non-PCV13 serotypes (NVT) at 26.2% and PCV13 serotypes (VT) at 5.1%. In a multivariate longitudinal analysis, pneumococcal carriage acquisition was higher in females than males (hazard ratio [HR], NVT [1.53]; VT [1.96]). It was also higher in low than high SES (NVT [1.38]; VT [2.06]), in adults living with 2 + than 1 child < 5y (VT [1.78]), and in ALWHIV on ART > 1y than HIV- adults (NVT [1.43]). Moreover, ALWHIV on ART > 1y cleared pneumococci slower than HIV- adults ([0.65]). Residual VT 19F and 3 were highly acquired, although NVT remained dominant.
Conclusions
The disproportionately high point prevalence of pneumococcal carriage in ALWHIV on ART > 1y is likely due to impaired nasopharyngeal clearance, which results in prolonged carriage. Our findings provide baseline estimates for comparing pneumococcal carriage dynamics after implementing new PCV strategies in ALWHIV.
| Item Type: | Article |
|---|---|
| Subjects: | QW Microbiology and Immunology > Immunotherapy and Hypersensitivity > QW 806 Vaccination WC Communicable Diseases > Infection. Bacterial Infections > Bacterial Infections > WC 217 Pneumococcal infections WC Communicable Diseases > Virus Diseases > Acquired Immunodeficiency Syndrome. HIV Infections > WC 503 Acquired immunodeficiency syndrome. HIV infections |
| Faculty: Department: | Clinical Sciences & International Health > Clinical Sciences Department Education |
| Digital Object Identifer (DOI): | https://doi.org/10.1186/s12916-024-03631-5 |
| SWORD Depositor: | JISC Pubrouter |
| Depositing User: | JISC Pubrouter |
| Date Deposited: | 14 Oct 2024 10:11 |
| Last Modified: | 14 Oct 2024 10:11 |
| URI: | https://archive.lstmed.ac.uk/id/eprint/25413 |
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