Pneumococcal Colonization in the Familial Context and Implications for Anti-Pneumococcal Immunization in Adults: Results from the BINOCOLO Project in Sicily

Fabio Tramuto, Emanuele Amodio, Giuseppe Calamusa, Vincenzo Restivo, Claudio Costantino, Francesco Vitale, The BINOCOLO Group, Fabio Tramuto, Emanuele Amodio, Giuseppe Calamusa, Vincenzo Restivo, Claudio Costantino, Francesco Vitale, The BINOCOLO Group

Abstract

The spread of Streptococcus pneumoniae within families has been scarcely investigated so far. This feasibility study aimed to estimate the prevalence of pneumococcal carriage in school-aged children and co-habiting relatives and to explore the potential link between the family environment and the sharing of pneumococcal serotypes covered by the vaccine. Oropharyngeal samples of 146 subjects belonging to 36 different family groups were molecularly tested for pneumococcal detection and serotyping. The overall prevalence of pneumococcal carriage was 65.8% (n = 96/146), whereas it was higher among schoolchildren (77.8%, n = 28/36); subjects of seven years of age had the highest odds of being colonized (odds ratio, OR = 5.176; p = 0.145). Pneumococcal serotypes included in the 13-valent conjugate vaccine formulation were largely detected in the study population and multiple serotypes colonization was considerable. Factors relating to a close proximity among people at the family level were statistically associated with pneumococcal carriage (OR = 2.121; p = 0.049), as well as active smoking habit with a clear dose-response effect (ORs = 1.017-3.326). About half of family clusters evidenced similar patterns of carried pneumococcal serotypes and the odds of sustaining a high level of intrafamilial sharing increased with household size (ORs = 1.083-5.000). This study highlighted the potential role played by the family environment in sustaining both the circulation and horizontal transmission of pneumococcus.

Keywords: Streptococcus pneumoniae; carriage; colonization; conjugate vaccine; family; horizontal transmission; real-time PCR; schoolchildren; serotypes.

Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Relative proportions of concurrent PCV13 serotypes identified in oropharyngeal swab specimens collected from healthy subjects positive for Streptococcus pneumoniae (co-colonization).
Figure 2
Figure 2
Distribution of PCV13 serotype (in ranking order) of colonizing pneumococcal strains collected from schoolchildren and household contacts. Bar graphs indicate the percentage of each serotype determined in relation to the total number of identified serotypes in the study period. Labels including the character “/” identify potential cross-reacting molecular targets.

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