Oral Candida Predicts Streptococcus mutans Emergence in Underserved US Infants

Area of Science:

• Oral microbiology
• Pediatric dentistry
• Infectious disease epidemiology

Background:

• Early childhood caries (ECC) disproportionately affects underserved populations, yet microbiological studies in these groups are limited.
• The role of Candida in ECC and its relationship with Streptococcus mutans in infants at high risk remain unclear.

Purpose of the Study:

• To investigate the oral colonization patterns of Candida and S. mutans in high-risk infants during their first year of life.
• To assess the association between early oral Candida colonization and the subsequent emergence of S. mutans.

Main Methods:

• Prospective cohort study of 101 infants from low-income, racial-minority backgrounds.
• Cox proportional hazard models were used to analyze the timing of Candida and S. mutans colonization.
• Salivary samples were analyzed for Candida and S. mutans presence and abundance.

Main Results:

• Oral Candida colonization was observed as early as 1 week, reaching 48% by 6 months.
• Streptococcus mutans was detected in 20% of infants by 1 year.
• Early Candida colonization significantly increased the risk of S. mutans emergence (HR 3.5) and was associated with maternal dental health.
• Infant S. mutans levels correlated positively with Candida albicans and Candida krusei.

Conclusions:

• Early oral Candida colonization is a significant risk factor for subsequent Streptococcus mutans acquisition in infants.
• Maternal factors, including oral Candida carriage and dental status, influence infant colonization.
• Further research is needed to explore Candida's role in ECC pathogenesis and develop targeted preventive strategies.