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Updated: May 2, 2026

Experimental Human Pneumococcal Carriage
Published on: February 15, 2013
Diet as a risk factor for pneumococcal carriage and otitis media: a cross-sectional study among children in day care
Terhi Tapiainen1, Niko Paalanne1, Tuula Arkkola2
1Department of Pediatrics, Oulu University Hospital, Oulu, Finland; Department of Pediatrics, University of Oulu, Oulu, Finland.
Insights
Children's diet impacts health. High sugar intake is linked to increased pneumococcal carriage and caries risk, while fruit consumption may decrease otitis media risk.
Area of Science:
- Pediatric Health
- Microbiology
- Nutritional Science
Background:
- Childhood diet influences pharyngeal bacteria exposure to sugars.
- Dietary carbohydrate intake may affect pneumococcal carriage and otitis media incidence.
Purpose of the Study:
- To investigate the association between dietary factors and pneumococcal carriage.
- To explore the link between diet and the occurrence of otitis media in children.
Main Methods:
- Cross-sectional study of 1006 children in day care centers.
- Food frequency questionnaires and oropharyngeal swabs were used.
- Principal component analysis identified nine dietary factors, adjusted for child and maternal characteristics.
Main Results:
- High intake of sweet pastries/jam correlated with increased pneumococcal carriage risk (OR 1.17).
- Frequent fruit/berry consumption associated with decreased acute otitis risk (coefficient -0.51).
- High sweets/snacks intake linked to increased caries risk (OR 1.36).
Conclusions:
- Dietary habits are associated with pneumococcal carriage and otitis media occurrence.
- Diet represents a potentially modifiable risk factor for acute otitis media in children.
Background:
Pharyngeal bacteria are exposed to different sugar conditions depending on the diet of the child. We hypothesized that dietary factors such as daily intake of carbohydrates could be associated with pneumococcal carriage and the occurrence of otitis media in children.
Methods:
Our study design was a cross-sectional study among 1006 children attending child day care centers. Parents filled in a food frequency questionnaire. Oropharyngeal swabs were collected from each child. The primary outcome was the occurrence of pneumococcal carriage and the secondary outcome the number of acute otitis media episodes during life. Principal component analysis was used to group dietary intake into nine factors. The models were adjusted for age, gender of the child and educational level of the mother.
Results:
The dietary factor which included high consumption of sweet pastries and jam was associated with an increased risk of pneumococcal carriage (OR 1.17, 95% CI 1.01 to 1.36, P-value 0.04). The factor including frequent consumption of fruit and berries was associated with a decreased risk of acute otitis (regression coefficient -0.51, 95% CI -0.98 to -0.03, P=0.04). A high intake of consumption of sweets and snacks (OR 1.36, 95% CI 1.03 to 1.80, P=0.03) was associated with an increased risk of caries.
Conclusions:
Diet was associated with a risk of pneumococcal carriage and the occurrence of otitis media. Diet may thus be a modifiable risk factor for the occurrence of acute otitis media.
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