Explore the prevalence of a newly discovered Streptococcus mutans serotype k in African-American schoolchildren from southwest Alabama and its potential link to systemic diseases. Delve into the PCR approach, protein antigens, collagen binding proteins, and the impact of oral hygiene on serotype distribution. Examine the relationship between ethnic groups, microbiota, and age groups, as well as gene exchange and practical applications. Investigate the association with cardiovascular risk, endocarditis, and the potential for probiotics. Learn about the discovery of serotype k, its rarity, and population changes over time in this informative ASM Live 2015 presentation by Stephanie Momeni from the University of Alabama at Birmingham.