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The nasopharyngeal bacterial flora in the sudden infant death syndrome
D R Telford1, J A Morris, P Hughes
1Lancaster Moor Hospital, U.K.
Insights
Sudden Infant Death Syndrome (SIDS) cases showed significantly disordered nasopharyngeal bacterial flora, with higher rates of Staphylococcus aureus, streptococci, and Enterobacteria compared to healthy infants. This suggests a potential role for bacterial toxins in SIDS pathogenesis.
Area of Science:
- Microbiology
- Pediatrics
- Pathogenesis
Background:
- Sudden Infant Death Syndrome (SIDS) remains a leading cause of post-neonatal infant mortality.
- The role of microbial factors in SIDS pathogenesis is not fully understood.
- Nasopharyngeal bacterial colonization patterns may differ between SIDS infants and healthy controls.
Purpose of the Study:
- To compare the nasopharyngeal bacterial flora of infants who died of SIDS with that of healthy infants.
- To identify specific bacterial species or groups that are differentially represented in SIDS cases.
- To provide data for investigating the hypothesis of bacterial toxin involvement in SIDS.
Main Methods:
- A case-control study design was employed.
- Nasopharyngeal swabs were collected from 46 SIDS infants and 46 age-matched healthy infants (2 weeks to 6 months).
- Bacterial cultures were performed to identify and quantify key bacterial groups, including Staphylococcus aureus, streptococci, and Enterobacteria.
Main Results:
- Significantly higher isolation rates of streptococci (78.3% vs. 32.6%, P < 0.0001) and Enterobacteria (45.6% vs. 2.2%, P < 0.0001) were observed in SIDS cases compared to healthy infants.
- Staphylococcus aureus was also more prevalent in SIDS cases (41.3% vs. 28.3%), though the difference was not statistically significant.
- These findings indicate a significant disruption in the normal nasopharyngeal bacterial community in SIDS infants.
Conclusions:
- The nasopharyngeal bacterial flora is significantly disordered in infants who died of SIDS.
- The observed alterations in bacterial colonization, particularly the increased prevalence of streptococci and Enterobacteria, may contribute to SIDS pathogenesis.
- These results support further investigation into the role of bacterial products and toxins in SIDS.
Abstract:
The nasopharyngeal bacterial flora in babies who had died of the sudden infant death syndrome (SIDS) (n = 46) and in healthy infants aged 2 weeks to 6 months (n = 46) is described. Of those who had died, 41.3% carried Staphylococcus aureus (95% confidence limits: 27.3-55.3%) compared with 28.3% of healthy infants (95% confidence limits: 15.3-41.3%). The isolation rate of streptococci was 78.3% in cases (95% confidence limits: 66.4-90.2%) and 32.6% in healthy infants (95% confidence limits: 19.1-46.1%) (significant difference P less than 0.0001). Enterobacteria were isolated from 45.6% of cases (95% confidence limits: 31.2-60%) but only 2.2% of healthy infants (95% confidence limits 0-6.4%) (significant difference, P less than 0.0001). These results indicate a disordered nasopharyngeal flora in SIDS. They also provide baseline data for investigating the hypothesis that common bacterial toxins are involved in the pathogenesis of SIDS.