Maternal perceptions of assisting preschool-aged children with toothbrushing.

BACKGROUND: Parent-led toothbrushing with fluoride toothpaste is part of an evidence-based strategy to prevent caries in children. There is a gap in the literature regarding perceptions of how and when to assist a child with toothbrushing from the maternal perspective. METHODS: A qualitative cross-sectional study was conducted with participants in North and North Central Appalachia to examine maternal perceptions of when and how to assist with toothbrushing. From 2018 through 2022, 301 mothers of children aged 3 through 5 years volunteered to participate in semistructured interviews from a more extensive parent study (Center for Oral Health Research in Appalachia cohort). The qualitative data were transcribed, coded, and analyzed using Nvivo software, Version 12 (QSR International). The data were analyzed using grounded theory, constant comparative method, and template analysis. RESULTS: A total of 301 mothers were interviewed for this study; 156 (52%) lived in West Virginia and 145 (48%) lived in Pittsburgh, Pennsylvania. Four main themes emerged: (1) assisting with child toothbrushing, (2) ceasing to provide assistance with child toothbrushing, (3) lacking recommendations from dental care professionals on child toothbrushing, and (4) adhering to recommendations from dental care professionals on child toothbrushing assistance. CONCLUSIONS: Understanding the factors that influence how parents brush their children's teeth and the information they receive to guide daily dental hygiene behavior for children is essential in developing effective interventions for preventing caries in children. PRACTICAL IMPLICATIONS: These insights can improve child toothbrushing quality through improved oral hygiene education, recommendations, terminology, and policies from the dental community.

Risk of Postpartum Dental Caries: Survival Analysis of Black/African American and White Women in Appalachia.

Background: Pregnancy is associated with increased risk of caries, but the extent this increase extends into the postpartum period is poorly understood. Study Objective: Describe the epidemiology of dental decay in the postpartum period among Black/African American and White American women and explore associations with potentially modifiable risk factors. Materials and Methods: We analyzed data from 1,131 Black/African American and White women participating in Center for Oral Health Research in Appalachia cohorts. Women were enrolled during the first two trimesters of pregnancy. Calibrated dental professionals completed dental examinations at the prenatal enrollment visit, and 2-month, 1-year, 2-year, and 3-year postpartum visits. Results: Between the prenatal visit and 2-month visit, the incidence of decayed, missing, and filled teeth (DMFT) increase was 6.92/100 person-months, compared to 3.6/100 person-months between the 2-month and 1-year visit. In a multivariate Cox proportional hazard regression predicting incidence of caries up to 3-years postpartum, being younger, having less than college education, a household income <$50,000, smoking cigarettes, a DMFT >0, a very poor or poor Oral hygiene Rating Index, lower salivary pH at enrollment, or frequently drinking 100% juice increased the hazard of new dental caries. Adjusting for race/ethnic group did not affect the direction or magnitude of observed associations. Conclusions: The strong associations of prior DMFT and Oral Rating Index with occurrence of new dental caries postpartum suggests that targeting young women for interventions to improve oral health may be more valuable for reducing caries incidence during pregnancy and in the postpartum period than targeting women only during pregnancy.

Smoking and salivary microbiota: a cross-sectional analysis of an Italian alpine population.

The oral microbiota plays an important role in the exogenous nitrate reduction pathway and is associated with heart and periodontal disease and cigarette smoking. We describe smoking-related changes in oral microbiota composition and resulting potential metabolic pathway changes that may explain smoking-related changes in disease risk. We analyzed health information and salivary microbiota composition among 1601 Cooperative Health Research in South Tyrol participants collected 2017-2018. Salivary microbiota taxa were assigned from amplicon sequences of the 16S-V4 rRNA and used to describe microbiota composition and predict metabolic pathways. Aerobic taxa relative abundance decreased with daily smoking intensity and increased with years since cessation, as did inferred nitrate reduction. Former smokers tended to be more similar to Never smokers than to Current smokers, especially those who had quit for longer than 5 years. Cigarette smoking has a consistent, generalizable association on oral microbiota composition and predicted metabolic pathways, some of which associate in a dose-dependent fashion. Smokers who quit for longer than 5 years tend to have salivary microbiota profiles comparable to never smokers.

Association of patient clinical and gut microbiota features with vancomycin-resistant enterococci environmental contamination in nursing homes: a retrospective observational study.

BACKGROUND: Preventing transmission is crucial for reducing infections with multidrug-resistant organisms (MDROs) in nursing homes. To identify resident characteristics associated with MDRO spread, we investigated associations between patient characteristics and contamination of their proximate room surfaces with vancomycin-resistant enterococci (VRE). METHODS: In this retrospective observational study, we used demographic and clinical data (including data on comorbidities, physical independence, catheter use within the past 30 days, and antibiotic exposure within the past 30 days) and surveillance cultures of patient body sites and room surfaces at enrolment and during weekly follow-up visits within the first month, and monthly thereafter (up to 6 months), in six US nursing homes collected in a previous clinical trial (September, 2016, to August, 2018). We did 16S rRNA gene sequencing on perirectal surveillance swabs to investigate the association between the gut microbiota and the culture status of participants and their rooms. FINDINGS: We included 245 participants (mean age 72·5 years [SD 13·6]; 111 [45%] were men, 134 [55%] were women, 132 [54%] were non-Hispanic white, and 112 [46%] were African American). We collected 2802 participant samples and 5592 environmental samples. At baseline, VRE colonisation was present in 49 (20%) participants, with environmental surfaces being contaminated in 36 (73%) of these patients. Hand contamination among VRE-colonised participants was more common in those with environmental contamination compared with those without (50 [51%] of 99 vs seven [13%] of 55; p<0·0001). We found a correlation between hand contamination and both groin and perirectal colonisation and contamination of various high-touch room surfaces (Cohen's κ 0·43). We found participant microbiota composition to be associated with antibiotic receipt within the past 30 days (high-risk antibiotics p=0·011 and low-risk antibiotics p=0·0004) and participant VRE colonisation status, but not environmental contamination among VRE-colonised participants (participant only vs uncolonised p=0·071, both participant and environment vs uncolonised p=0·025, and participant only vs participant and environment p=0·29). Multivariable analysis to identify independent factors associated with VRE-colonised participants contaminating their environment identified antibiotic exposure (adjusted odds ratio 2·75 [95% CI 1·22-6·16]) and male sex (2·75 [1·24-6·08]) as being associated with increased risk of environmental contamination, and physical dependence as being associated with a reduced risk of environmental contamination (0·91 [0·83-0·99]). INTERPRETATION: Our data support antibiotic use and interaction with proximal surfaces by physically independent nursing home residents as under-appreciated drivers of environmental contamination among VRE-colonised residents. Integrating resident hand-hygiene education and antimicrobial stewardship will strengthen efforts to reduce MDROs in nursing homes. FUNDING: US Centers for Disease Control and Prevention, National Institute of Health, Canadian Institutes of Health Research, and University of Michigan.

Potential risk factors and genetic variants associated with dental caries incidence in Appalachia using genome-wide survival analysis.

OBJECTIVE: The aim of this study was to identify the potential risk factors and genetic variants associated with dental caries incidence using survival analysis. METHODS: The Center for Oral Health Research in Appalachia recruited and prospectively followed pregnant women and their children. A total of 909 children followed from birth for up to 7 years were included in this study. Annual intra-oral examinations were performed to assess dental caries experience including the approximate time to first caries incidence in the primary dentition. Cox proportional hazards models were used to assess the associations of time to first caries incidence with self-reported risk factors and 4.9 million genetic variants ascertained using a genome-wide genotyping array. RESULTS: A total of 196 of 909 children (21.56%) had their first primary tooth caries event during follow-up. Household income, home water source, and mother's educational attainment were significantly associated with time to first caries incidence in the stepwise Cox model. The heritability (i.e., proportion of variance explained by genetics) of time to first caries was 0.54. Though no specific genetic variants were associated at the genome-wide significance level (P < 5E-8), we identified 14 loci at the suggestive significance level (5E-8 < P < 1E-5), some of which were located within or near genes with plausible biological functions in dental caries. CONCLUSION: Our findings indicate that household income, home water source, and mother's educational attainment are independent risk factors for dental caries incidence. We nominate several suggestive loci for further investigation.

Meta-analysis reveals the vaginal microbiome is a better predictor of earlier than later preterm birth.

BACKGROUND: High-throughput sequencing measurements of the vaginal microbiome have yielded intriguing potential relationships between the vaginal microbiome and preterm birth (PTB; live birth prior to 37 weeks of gestation). However, results across studies have been inconsistent. RESULTS: Here, we perform an integrated analysis of previously published datasets from 12 cohorts of pregnant women whose vaginal microbiomes were measured by 16S rRNA gene sequencing. Of 2039 women included in our analysis, 586 went on to deliver prematurely. Substantial variation between these datasets existed in their definition of preterm birth, characteristics of the study populations, and sequencing methodology. Nevertheless, a small group of taxa comprised a vast majority of the measured microbiome in all cohorts. We trained machine learning (ML) models to predict PTB from the composition of the vaginal microbiome, finding low to modest predictive accuracy (0.28-0.79). Predictive accuracy was typically lower when ML models trained in one dataset predicted PTB in another dataset. Earlier preterm birth (< 32 weeks, < 34 weeks) was more predictable from the vaginal microbiome than late preterm birth (34-37 weeks), both within and across datasets. Integrated differential abundance analysis revealed a highly significant negative association between L. crispatus and PTB that was consistent across almost all studies. The presence of the majority (18 out of 25) of genera was associated with a higher risk of PTB, with L. iners, Prevotella, and Gardnerella showing particularly consistent and significant associations. Some example discrepancies between studies could be attributed to specific methodological differences but not most study-to-study variations in the relationship between the vaginal microbiome and preterm birth. CONCLUSIONS: We believe future studies of the vaginal microbiome and PTB will benefit from a focus on earlier preterm births and improved reporting of specific patient metadata shown to influence the vaginal microbiome and/or birth outcomes.

Bacterial community modifies host genetics effect on early childhood caries.

Background: By age five approximately one-fifth of children have early childhood caries (ECC). Both the oral microbiome and host genetics are thought to influence susceptibility. Whether the oral microbiome modifies genetic susceptibility to ECC has not been tested. We test whether the salivary bacteriome modifies the association of a polygenic score (PGS, a score derived from genomic data that summarizes genetic susceptibility to disease) for primary tooth decay on ECC in the Center for Oral Health Research in Appalachia 2 longitudinal birth cohort. Methods: Children were genotyped using the Illumina Multi-Ethnic Genotyping Array and underwent annual dental examinations. We constructed a PGS for primary tooth decay using weights from an independent, genome-wide association meta-analysis. Using Poisson regression, we tested for associations between the PGS (high versus low) and ECC incidence, adjusting for demographic characteristics (n=783). An incidence-density sampled subset of the cohort (n=138) had salivary bacteriome data at 24- months of age. We tested for effect modification of the PGS on ECC case status by salivary bacterial community state type (CST). Results: By 60-months, 20.69% of children had ECC. High PGS was not associated with an increased rate of ECC (incidence-rate ratio:1.09 (95% confidence interval (CI): 0.83, 1.42)). However, having a cariogenic salivary bacterial CST at 24-months was associated with ECC (odds ratio (OR): 7.48 (95%CI: 3.06, 18.26)), which was robust to PGS adjustment. An interaction existed between the salivary bacterial CST and the PGS on the multiplicative scale (P= 0.04). The PGS was associated with ECC (OR: 4.83 (95% CI: 1.29, 18.17)) only among individuals with a noncariogenic salivary bacterial CST (n=70). Conclusions: Genetic causes of caries may be harder to detect when not accounting for cariogenic oral microbiomes. As certain salivary bacterial CSTs increased ECC-risk across genetic-risk strata, preventing colonization of cariogenic microbiomes would be universally beneficial.

Genome-Wide Analysis of Dental Caries Variability Reveals Genotype-by-Environment Interactions.

Genotype-by-environment interactions (GEI) may influence dental caries, although their effects are difficult to detect. Variance quantitative trait loci (vQTL) may serve as an indicator of underlying GEI effects. The aim of this study was to investigate GEI effects on dental caries by prioritizing variants from genome-wide vQTL analysis. First, we identified vQTLs from ~4.3 M genome-wide variants in three cohorts of white children aged 3-5 (n = 396, n = 328, n = 773) using Levene's test. A total of 39 independent vQTLs with p < 1 × 10-6 were identified, some of which were located in or near genes with plausible biological roles in dental caries (IGFBP7, SLC5A8, and SHH involved in tooth development and enamel mineralization). Next, we used linear regression to test GEI effects on dental caries with the 39 prioritized variants and self-reported environmental factors (demographic, socioeconomic, behavioral, and dietary factors) in the three cohorts separately. We identified eight significant GEIs indicating that children with vQTL risk genotypes had higher caries experience if they had less educated parents, lower household/parental income, brushed their teeth less frequently, consumed sugar-sweetened beverages more frequently, were not breastfed, and were female. We reported the first genome-wide vQTL analysis of dental caries in children nominating several novel genes and GEI for further investigations.

Food insecurity and consumption of cariogenic foods in mothers and their two-year-old children in Appalachia.

OBJECTIVES: To describe the association between household food insecurity and intake of cariogenic foods that increase risk of dental caries. METHODS: Cross-sectional analysis of 842 mothers in Appalachia and their children participating in the Center for Oral Health Research Cohort 2 between 2011 and 2017 when their children were ~ 24 months of age. Mothers completed a telephone interview regarding cariogenic food consumption and food insecurity. Associations between food insecurity and daily food intake were adjusted for education, income, state residence, and daily snacking. RESULTS: After adjustment for household income, state residence, daily snacking, and maternal education, mothers from moderately/severely food insecure households drank on average ½ more sugar-sweetened beverage servings per day (p = 0.005) and children drank almost 1/3 servings more (p = 0.006). Further, mothers and children from moderately/severely food insecure households had lower, but not statistically significant, daily average consumption of vegetables (mothers: 1/5 less of a vegetable serving per day, children: ~1/10 less) and fruits (mothers: 1/5 less of a fruit serving per day, children: ~ 1/10 les) and elevated consumption of sweets (mothers: ~ 1/25 more sweet servings per day, children: ~ 2/25 more); differences based on state residence were noted. CONCLUSIONS: Food insecurity is associated with higher consumption of foods that increase risk of dental caries, but this association is modified by maternal education, income, and state residence. Food insecurity, and its socioeconomic determinants, should be considered when designing and implementing interventions to prevent dental caries.

Impact of Technological Developments on Infectious Disease Epidemiology: Lessons From the First 100 Years of the American Journal of Epidemiology.

Technological developments in laboratory and epidemiologic methods, combined with increasing computing power, have synergistically increased our understanding of the epidemiology of infectious disease. Using historical examples from the first 100 years of the American Journal of Epidemiology, we illustrate how these developments provided the foundation for the rapid detection of the agent causing coronavirus disease 2019 (COVID-19), severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), from its transmission efficiency and modalities, risk factors, and natural history to the evaluation of new vaccines and treatments to control its spread and impact. Comparisons with timelines for elucidation of the epidemiology, natural history, and control of other infectious diseases, including viral hepatitis, humbly remind us of how much past discoveries have paved the way for more rapid discovery of and response to new pathogens. We close with some comments on a potential future role of the Journal in infectious disease epidemiology.

Maternal factors and risk of early childhood caries: A prospective cohort study.

OBJECTIVE: To evaluate the associations between time-varying factors (mother's oral health, oral hygiene, smoking habits, diet, food insecurity and stress) socioeconomic factors (mother's employment, marital status, household income, insurance status, household size) and medical history on children's risk of developing a carious lesion in the first 3 years of life. METHODS: Longitudinal data from the Center for Oral Health Research in Appalachia Cohort Two (COHRA2) were analysed. Pregnant women ≥18 years in the USA were recruited during pregnancy; all consenting women delivering at term and their babies had regular dental assessments and complete in-person surveys and telephone interviews regarding sociodemographic factors, medical and dental history, and oral health behaviours. RESULTS: In a logistic regression model adjusting for covariates, children whose mother had two or more prior pregnancies, smoked cigarettes post-partum, or had a recent unfilled carious lesion were at least twice as likely to experience a dental lesion by the three-year visit. The magnitude of these associations varied by maternal education and state of residence. CONCLUSIONS: Untreated maternal decay but not maternal oral hygiene or diet were associated with cumulative risk of childhood caries by age three but were modified by maternal education and state of residence. Addressing structural and behavioural issues that reduce use of restorative dental care are needed to prevent the adverse impacts associated with early childhood caries.

Factors affecting maternal decision making about grandparents' cariogenic dietary choices for children: A qualitative study.

BACKGROUND: Added sugar in children's diets puts them at higher risk of developing caries. Researchers have reported that grandparents frequently give their grandchildren cariogenic foods and beverages (for example, those with added sugars) and disagreements between grandparents and parents can ensue over this issue. This study's objective was to examine factors that influence whether mothers address grandparents about giving their grandchildren cariogenic foods and beverages. METHODS: In-person, semistructured qualitative interviews were conducted with 126 mothers of children aged 3 through 5 years from Pittsburgh, Pennsylvania, and West Virginia from 2018 through 2020. Qualitative data for this study were audio recorded, transcribed verbatim, imported into NVivo for coding, and analyzed using iterative theme development via a constant comparative process. RESULTS: In this study, 72% of mothers (91 of 126) indicated that grandparents gave their grandchildren cariogenic foods and beverages, and 51% of those mothers (46 of 91) addressed the issue with grandparents. Mothers described that the following factors influenced whether they addressed grandparents on this issue: frequency of interaction between grandparents and children, mothers' dependency on grandparents for childcare, quantity of cariogenic foods and beverages that grandparents provided, and strength of mothers' relationships with grandparents. CONCLUSIONS: There is evidence that some mothers consider the frequency and quantity of cariogenic foods and beverages, as well as social factors, when deciding whether to engage with grandparents about the cariogenic foods and beverages they give to their grandchildren. PRACTICAL IMPLICATIONS: Initiatives aimed to decrease childhood caries should consider how interpersonal family relationships may need to be addressed as part of successful sugar-reduction interventions.

Mother's Experience of Conflict Within Their Family Social Network when Advocating for Children's oral Health.

OBJECTIVES: Examine whether mothers perceived that child oral health was a source of conflict in family relationships. METHODS: This cross-sectional qualitative study consisted of 126 semi-structured interviews with mothers of 3-5 year-old children from West Virginia and Pittsburgh, Pennsylvania. Interviews consisted of open-ended questions on the mother's social relationships that affected child dental visits, oral hygiene, and diet. The data were analyzed using template analysis. RESULTS: Over 85% (n = 111/126) of mothers reported interpersonal conflict in their familial relationships related to child oral health. Most (78%) mothers reported conflict with their partners and 58% of mothers reported conflict with the child's grandparents. Conflicts primarily centered around keeping a consistent oral hygiene routine for the child and the promotion of a low-cariogenic diet. CONCLUSIONS FOR PRACTICE: Mothers perceived child oral health promotion as a source of conflict in the family. This study suggests that identifying effective strategies to reduce conflict with caretakers are indicated. Oral health professionals can take an active role not only in communicating with the mother, but also with other caretaking adults in the family to promote oral health practices that benefit all children.

Evaluating the ecological hypothesis: early life salivary microbiome assembly predicts dental caries in a longitudinal case-control study.

BACKGROUND: Early childhood caries (ECC)-dental caries (cavities) occurring in primary teeth up to age 6 years-is a prevalent childhood oral disease with a microbial etiology. Streptococcus mutans was previously considered a primary cause, but recent research promotes the ecologic hypothesis, in which a dysbiosis in the oral microbial community leads to caries. In this incident, density sampled case-control study of 189 children followed from 2 months to 5 years, we use the salivary bacteriome to (1) prospectively test the ecological hypothesis of ECC in salivary bacteriome communities and (2) identify co-occurring salivary bacterial communities predicting future ECC. RESULTS: Supervised classification of future ECC case status using salivary samples from age 12 months using bacteriome-wide data (AUC-ROC 0.78 95% CI (0.71-0.85)) predicts future ECC status before S. mutans can be detected. Dirichlet multinomial community state typing and co-occurrence network analysis identified similar robust and replicable groups of co-occurring taxa. Mean relative abundance of a Haemophilus parainfluenzae/Neisseria/Fusobacterium periodonticum group was lower in future ECC cases (0.14) than controls (0.23, P value < 0.001) in pre-incident visits, positively correlated with saliva pH (Pearson rho = 0.33, P value < 0.001) and reduced in individuals who had acquired S. mutans by the next study visit (0.13) versus those who did not (0.20, P value < 0.01). In a subset of whole genome shotgun sequenced samples (n = 30), case plaque had higher abundances of antibiotic production and resistance gene orthologs, including a major facilitator superfamily multidrug resistance transporter (MFS DHA2 family PBH value = 1.9 × 10-28), lantibiotic transport system permease protein (PBH value = 6.0 × 10-6) and bacitracin synthase I (PBH value = 5.6 × 10-6). The oxidative phosphorylation KEGG pathway was enriched in case plaque (PBH value = 1.2 × 10-8), while the ABC transporter pathway was depleted (PBH value = 3.6 × 10-3). CONCLUSIONS: Early-life bacterial interactions predisposed children to ECC, supporting a time-dependent interpretation of the ecological hypothesis. Bacterial communities which assemble before 12 months of age can promote or inhibit an ecological succession to S. mutans dominance and cariogenesis. Intragenera competitions and intergenera cooperation between oral taxa may shape the emergence of these communities, providing points for preventive interventions. Video Abstract.

Early Childhood Diet in Relation to Toddler Nighttime Sleep Duration Trajectories.

The objective of this study was to evaluate whether dietary habits at age 2 associate with sleep duration trajectories through age 5 in children from north and central Appalachia. A total of 559 children from the Center for Oral Health Research in Appalachia (COHRA) cohort 2 were followed via caregiver phone interviews up to six times between ages 2 and 5. Exposures included data from the year 2 interview: sleep habits, household and demographic characteristics, meal patterns and consumption frequencies of fruits, vegetables, water, juice, milk, and soda. Sleep duration trajectories were identified using group-based trajectory models from ages 2 to 5. Three distinct nightly sleep duration trajectories were identified: short, increasing duration (4.5% of the study population); steady, 9 h of sleep (37.3%); and longer, slightly decreasing sleep duration (58.2%). Using multinomial logistic models that accounted for confounders, children with consistent meal patterns (i.e., meals and snacks at same time every day) and with higher fruit and vegetable consumption were more likely to follow the longer duration sleep trajectory compared to the steady sleep trajectory. In contrast, children who drank milk more frequently at age 2 were less likely to be in the longer duration sleep trajectory than the steady sleep trajectory.

Racism in oral healthcare settings: Implications for dental care-related fear/anxiety and utilization among Black/African American women in Appalachia.

OBJECTIVE: To explore the association of racism in oral healthcare settings and dental care-related fear/anxiety with dental utilization among Black/African American women in Appalachia. METHODS: We analyzed self-report measures of racism in oral healthcare settings, dental care-related anxiety and fear, recency of a dental visit, and demographic information from 268 pregnant women participating in the Center for Oral Health Research in Appalachia (COHRA) SMILE cohort. All participants self-identified as African American or Black and resided in Appalachia (i.e., either West Virginia or Pittsburgh, PA). RESULTS: Over one-third of the participants reported at least one instance of racism in oral healthcare settings, with "not being listened to" due to their race or color as the most frequent issue (24.4%). Clinically significant levels of dental care-related anxiety and fear were reported by 14.3% of the sample. A mediational model demonstrated that the experience of racism in oral healthcare settings was a significant predictor of dental fear/anxiety, and that dental fear/anxiety was a significant predictor of dental utilization. There was a significant relationship between racism in oral healthcare settings and dental utilization only when mediated by the presence of dental care-related fear and anxiety. CONCLUSIONS: Together, experiences of racism in oral healthcare settings and dental care-related fear/anxiety are predictive of decreased dental utilization for Black/African American women living in Appalachia. This study provides insight into racism in oral healthcare settings as a social determinant of dental anxiety/fear and inequities in dental utilization.

Mothers' Sources of Child Fluoride Information and Misinformation From Social Connections.

Importance: Fluoride delivered either topically (eg, fluoride varnish) or systemically (eg, water fluoridation, prescription fluoride supplements) is widely used as a caries preventive agent in children. The widespread existence of misinformation, including inaccurate information that attaches negative values or suspicion to fluoride treatments, raises concerns that misinformation will lead to underutilization of fluoride and contribute to avoidable increases in caries prevalence. Objective: To describe the social relationships from which mothers obtain child fluoride information and misinformation. Design, Setting, and Participants: This qualitative study analyzed 126 mothers with children aged 3 to 5 years to explore how their social networks were associated with their child's oral health. Mothers were recruited from community-based sites in Pittsburgh, Pennsylvania, and throughout the state of West Virginia from 2018 to 2020. In-person, semi-structured qualitative interviews were conducted. Data were transcribed, coded, and analyzed using Nvivo 12. Three investigators analyzed data using template analysis, a qualitative technique that combines inductive and deductive approaches to identify patterns until primary themes are identified. Main Outcomes and Measures: Sources of information regarding fluoride from the mother's social relationships. Results: Of the 126 mothers with children aged 3 to 5 years in Pittsburgh and West Virginia, 120 (95%) identified as non-Hispanic White and 5 (4%) identified as Hispanic White; 38 (30%) had a bachelor's degree, 77 (61%) had private dental insurance for their child, and 52 (41%) had an income less than $50 000; 82 (65%) reported that they discussed child fluoride information with members of their social network. Mothers described that they obtained fluoride information from family members, health care clinicians, and community members. The receipt of inconsistent child fluoride information from multiple sources resulted in confusion and difficulty assessing whether fluoride information was accurate. Conclusions and Relevance: This qualitative study found that mothers received inconsistent child fluoride information from multiple sources, which resulted in confusion and difficulty assessing the accuracy of the fluoride information. These findings suggest that social relationships can be a potential target for interventions to communicate fluoride information related to children.

Exploring Mothers' Perspectives About Why Grandparents in Appalachia Give Their Grandchildren Cariogenic Foods and Beverages: A Qualitative Study.

BACKGROUND: Dental caries is the most common chronic childhood disease. Past studies revealed that grandparents provide their grandchildren with cariogenic foods and beverages (eg, those with free sugars and/or modified starches). Qualitative research can help identify what drives this phenomenon. OBJECTIVE: Our aim was to examine mothers' explanations for why grandparents in north central and central Appalachia give their grandchildren cariogenic foods and beverages. DESIGN: A qualitative study on children's oral health in Pennsylvania and West Virginia from 2018 through 2020 was performed. In-person, semi-structured interviews were conducted. Qualitative data from interviews were recorded, transcribed, and then coded using NVivo. Data analysis for this study was performed using thematic analysis with iterative theme development. PARTICIPANTS/SETTING: The participants were 126 mothers of children aged 3-5 years from West Virginia (n = 66) and Pittsburgh, PA (n = 60). MAIN OUTCOME MEASURES: Mothers' perspectives about why grandparents give their grandchildren cariogenic foods and beverages were analyzed. RESULTS: In the study sample, 85% of mothers (n = 107/126) named at least 1 of their children's grandparents as a member of their social network responsible for their children's oral health. From these interviews, 85% of mothers (n = 91/107) discussed that grandparents gave their grandchildren cariogenic foods and beverages. The mothers described the following 4 themes to explain why grandparents gave their grandchildren cariogenic foods and beverages: privilege of the grandparent role; responsibilities of the grandparent role; symbol of care and affection; and limited consideration or understanding of the detrimental impact. CONCLUSIONS: Grandparents play a role in giving their grandchildren cariogenic foods and beverages, which could potentially contribute to childhood caries. Research is needed to develop effective social interventions to help some grandparents understand the implications of a cariogenic diet on their grandchildren's oral health and/or decrease their provision of cariogenic foods and beverages.

Minimizing treatment-induced emergence of antibiotic resistance in bacterial infections.

Treatment of bacterial infections currently focuses on choosing an antibiotic that matches a pathogen's susceptibility, with less attention paid to the risk that even susceptibility-matched treatments can fail as a result of resistance emerging in response to treatment. Combining whole-genome sequencing of 1113 pre- and posttreatment bacterial isolates with machine-learning analysis of 140,349 urinary tract infections and 7365 wound infections, we found that treatment-induced emergence of resistance could be predicted and minimized at the individual-patient level. Emergence of resistance was common and driven not by de novo resistance evolution but by rapid reinfection with a different strain resistant to the prescribed antibiotic. As most infections are seeded from a patient's own microbiota, these resistance-gaining recurrences can be predicted using the patient's past infection history and minimized by machine learning-personalized antibiotic recommendations, offering a means to reduce the emergence and spread of resistant pathogens.

In vitro model systems for exploring oral biofilms: From single-species populations to complex multi-species communities.

Numerous in vitro biofilm model systems are available to study oral biofilms. Over the past several decades, increased understanding of oral biology and advances in technology have facilitated more accurate simulation of intraoral conditions and have allowed for the increased generalizability of in vitro oral biofilm studies. The integration of contemporary systems with confocal microscopy and 16S rRNA community profiling has enhanced the capabilities of in vitro biofilm model systems to quantify biofilm architecture and analyse microbial community composition. In this review, we describe several model systems relevant to modern in vitro oral biofilm studies: the constant depth film fermenter, Sorbarod perfusion system, drip-flow reactor, modified Robbins device, flowcells and microfluidic systems. We highlight how combining these systems with confocal microscopy and community composition analysis tools aids exploration of oral biofilm development under different conditions and in response to antimicrobial/anti-biofilm agents. The review closes with a discussion of future directions for the field of in vitro oral biofilm imaging and analysis.