Daniel Soto

Keck School of Medicine USC · Institute for Health Promotion and Disease Prevention Research

Youth of immigrant origin vary across their families’ migration history (e.g., country of heritage, reasons for migration, etc.) and in the communities in which they reside. As such, these youth are often faced with different cultural and immigrant stressors. Although prior research documented the detrimental impact of cultural and immigrant stress...

Purpose: The purpose of this study is to evaluate a COVID-19 rapid antigen testing program among high school athletes through testing data and qualitative analysis from key stakeholders. Methods: Testing data was obtained by the partnering school district. Testing staff, coaches, and parents participated in a focus group using a semi-structured...

Although authorized mRNA COVID-19 vaccines (BNT162b2 by BioNTech/Pfizer and mRNA-1273 by Moderna) significantly reduce morbidity and mortality, recent evidence suggests that immunity wanes over time, and that a booster dose could further reduce COVID-19 transmission and severe illness. However, research examining attitudes on booster willingness in...

Objective This study examined characteristics associated with being unvaccinated among a sample of university staff and faculty prior to university campus reopening for in-person learning in 2021. Methods Staff and faculty responded to an email invitation to complete an online survey. Survey questions included demographic data (race/ethnicity, age...

Background: School-based COVID-19 testing is a potential strategy to limit COVID-19 transmission among youth in congregate settings such as schools, sports programs, and summer camps. The purpose of this study is to evaluate the feasibility and effectiveness of frequent rapid antigen testing at a supervised distance-learning setting for elementary...

Background School-based COVID-19 testing is a potential strategy to facilitate the safe reopening of schools that have been closed due to the pandemic. This qualitative study assessed attitudes toward this strategy among four groups of stakeholders: school administrators, teachers, parents, and high school students. Methods Focus groups and interv...

Purpose Cannabis use among adolescents may have detrimental effects and use among this age group is increasing. It is important to understand how expansion of laws permitting cannabis sales may impact adolescent use. Much of the current research has explored how state-level policy decisions may impact adolescents’ use behaviors; however, there is a...

Introduction Although COVID-19 vaccines significantly reduce morbidity and mortality, recent evidence suggests that immunity wanes after 6-9 months, and that a third vaccine dose could further reduce COVID-19 transmission and severe illness. However, previous studies have not assessed attitudes about getting booster doses. This study examined COVID...

Background School-based COVID-19 testing is a potential strategy to facilitate the safe reopening of schools that have been closed due to the pandemic. This qualitative study assessed attitudes toward this strategy among four groups of stakeholders: school administrators, teachers, parents, and high school students. Methods Focus groups and intervi...

Objective: This study examined characteristics associated with being unvaccinated among a sample of university staff and faculty prior to university campus reopening for in-person learning in spring-summer 2021. Methods: Staff and faculty responded to an email invitation to complete an online survey. Survey questions included demographic data (race...

Objectives. Despite the widespread availability of COVID-19 vaccines in the United States, vaccine hesitancy remains high among certain groups. This study examined the correlates of being unvaccinated among a sample of university students (N=2900) during the spring and summer of 2021, when the campus had been closed for over a year and students wer...

The current study was designed to address gaps in the existing literature by examining the role of discrimination and familism values as predictors of multiple forms of prosocial behaviors across time in a sample of recent immigrant Latino/a adolescents. Participants were 302 recent immigrant Latino/a adolescents (53.3% male; average age 14.51 year...

Although there is a substantial body of work focusing on the processes underlying cultural identity in general, less is known regarding how these processes might operate within the context of Latinx families. Moreover, among the limited research that has included the adolescent and caregiver cultural identity, most of the research has primarily foc...

Background Starting in 2019 policies restricting the availability of flavored e-cigarette products were proposed or implemented in the U.S. to curb vaping by youth. People took to Twitter to voice their opposition, referencing the phrase “Flavors Save Lives”. This study documented the emerging themes pertaining to “Flavors Saves Lives” over a 12-mo...

During the last four years, xenophobic rhetoric directed toward Latino immigrants in U.S. media outlets and political forums has greatly increased. Using a general inductive approach, this qualitative study examined the forms of cultural stress, with a focus on discrimination and xenophobia, experienced by Latino adolescents in urban U.S. settings...

This study examined whether unlicensed and licensed cannabis retailers in California are disproportionately located in neighborhoods with minority populations or populations living below the Federal Poverty Level. We mapped the locations of licensed and unlicensed cannabis retailers in California in October 2018, combining advertisements from canna...

With a growing population of Latinx youth immigrating to the United States, it is important to understand how Latinx youth adapt to mainstream U.S. culture. Given that the majority of research examining social development among recent immigrant adolescents has focused on negative adjustment outcomes, research examining positive social behaviors is...

Introduction JUUL, a small pod-based vaping device that aerosolizes nicotine salts, is popular among adolescents and young adults. Because of JUUL’s high nicotine content, JUUL users can become nicotine dependent very quickly and have difficulty quitting. Nicotine-dependent JUUL users might turn to Twitter to seek advice, share their cessation stru...

Ethnic identity is a consistent predictor of positive youth adjustment, whereas discrimination has been associated with negative outcomes among Latino/a youth. Scholars have proposed associations between ethnic identity and discrimination; however, directionality of effects remains unclear. Addressing this gap, the current study examined the direct...

Background: The Acculturative Process and Context Framework (Ward & Geeraert, 2016) proposes that acculturative stressors influence psychological well-being over time. In fact, extant literature has linked bicultural stress with psychological functioning; yet, no studies have explored the causal dominance of bicultural stress. The purpose of the p...

Background: Prior research has not examined whether tobacco brand websites vary content based on audience demographics. This study explored whether marketing content on tobacco brand websites varied by user ethnicity, gender or age group. Methods: Participants (n = 32) were adult smokers, representing equal numbers of eight demographic groups: u...

Purpose: Hispanic residents of multiunit housing (MUH) are disproportionately exposed to secondhand (SHS) and thirdhand tobacco smoke (THS) from neighboring apartment units and common areas. Comprehensive legislation and voluntary policies are needed to protect residents from smoke. We developed a culturally tailored bilingual fotonovela to educate...

There is a growing recognition for the need for research to explore the unique and interactive effects of acculturation and sociocultural stress on alcohol initiation. Building on this research agenda, the current study sought to explore the independent and interactive effects of acculturation (i.e., heritage and U.S. cultural practices and identif...

Objectives: This study explored whether cultural identity predicts health lifestyle behaviors. Method: Participants included 302 recently immigrated (<5 years in the U.S.) Latinx adolescents (53% boys; mean age 14.51 years at baseline) from Miami and Los Angeles. Participants completed cultural identity measures at baseline and 1-year post basel...

Purpose: This case-control study compared substance use behaviors between Hispanic adolescent and young adult survivors of childhood cancers (cases) and a community sample of participants without cancer (controls). Methods: A total of 100 cases were matched to controls (200 participants) one to one by ethnicity, age, and sex (mean age at survey...

Acculturation consists of multiple domains (i.e., cultural practices, identifications, and values). However, less is known about how acculturation processes influence each other across multiple domains of acculturation. The present study was designed to investigate transition patterns of acculturative processes within and across domains in a sample...

Secondhand and third hand smoke (SHS, THS) exposure is prevalent in multi-unit housing (MUH). Minorities and low-income MUH residents are disproportionally exposed to SHS and THS compared to other populations. This study describes the characteristics, attitudes, knowledge, and behaviors related to SHS, THS and marijuana smoke exposure (MSHS) of a s...

Ethnic identity formation is a central developmental task that can become challenging when adolescents face a salient stressor, such as ethnic discrimination. Although ethnic identity and experiences with ethnic discrimination are thought to be associated, the temporal order of these constructs is unclear. In the current study, we examined (1) the...

Introduction: Limited information exists about strategies and methods used on brand marketing websites to transmit pro-tobacco messages to tobacco users and potential users. This study compared age verification methods, themes, interactive activities and links to social media across tobacco brand websites. Methods: This study examined 12 tobacco...

This study examined longitudinal effects of adolescent and parent cultural stress on adolescent and parent emotional well-being and health behaviors via trajectories of adolescent and parent family functioning. Recent immigrant Latino adolescents (Mage = 14.51) and parents (Mage = 41.09; N = 302) completed measures of these constructs. Latent growt...

The present study was designed to examine trajectories of personal identity coherence and confusion among Hispanic recent-immigrant adolescents, as well as the effects of these trajectories on psychosocial and risk-taking outcomes. Personal identity is extremely important in anchoring young immigrants during a time of acute cultural change. A sampl...

Objective: Despite the prevalence of interpersonal violence (IPV), scientific understanding of the risk and protective factors for unidirectional and bidirectional IPV, and especially the role of sociocultural variables in these behaviors, is limited. This study investigates the association between ethnic-identity search, ethnic-identity affirmati...

Despite the progressive adoption of smoking bans in public spaces, children living in multi-unit housing remain at risk of exposure to secondhand smoke (SHS) and thirdhand smoke (THS). Hispanic populations in California are particularly vulnerable to the harmful effects of SHS and THS because a large proportion of Hispanics live in multi-unit housi...

Objectives: This study examined directionality between personal (i.e., coherence and confusion) and cultural identity (i.e., ethnic and US) as well as their additive effects on psychosocial functioning in a sample of recently immigrated Hispanic adolescents. Methods: The sample consisted of 302 recent (<5 years) immigrant Hispanic adolescents (53%...

Latino parents can experience acculturation stressors, and according to the Family Stress Model (FSM), parent stress can influence youth mental health and substance use by negatively affecting family functioning. To understand how acculturation stressors come together and unfold over time to influence youth mental health and substance use outcomes,...

Parent-adolescent discrepancies in family functioning play an important role in HIV risk behaviors among adolescents, yet longitudinal research with recent immigrant Hispanic families remains limited. This study tested the effects of trajectories of parent–adolescent family functioning discrepancies on HIV risk behaviors among recent-immigrant Hisp...

U.S. Latino parents can face cultural stressors in the form of acculturative stress, perceived discrimination, and a negative context of reception. It stands to reason that these cultural stressors may negatively impact Latino youth's emotional well-being and health risk behaviors by increasing parents' depressive symptoms and compromising the over...

Hispanic adolescents in the United States experience a wide range of cultural challenges including acculturative stress (Romero et al. 2007), discrimination from members of the majority culture and other cultures (Pérez et al. 2008), family conflict resulting from parent-child acculturation discrepancies (Szapocznik et al. 1978; Unger et al. 2009),...

Objective: Latino/a youth are at risk for alcohol use. This risk seems to rise with increasing US cultural orientation and decreasing Latino cultural orientation, especially among girls. To ascertain how acculturation may influence Latino/a youth alcohol use, we integrated an expanded multi-domain model of acculturation with the Theory of Reasoned...

Policies regulating the sale and use of electronic cigarettes (e-cigarettes) vary widely within the USA and worldwide. We assessed support for four proposed policies among a representative sample of California voters (N=1002) and identified latent classes of voters who were likely to support or oppose various policies. Findings showed support for p...

Objectives: There is considerable debate among the public health community about the health risks of secondhand exposure to the aerosol from electronic cigarettes (e-cigarettes). Despite mounting scientific evidence on the chemical content of e-cigarette aerosol, public perceptions of the relative safety of secondhand e-cigarette aerosol have not...

Purpose: Electronic cigarettes (e-cigarettes) could have a multifaceted effect on public health by changing the likelihood that: (a) non-smokers and non-users of marijuana subsequently transition to cigarette and marijuana use, respectively, and/or: (b) cigarette smokers subsequently quit smoking. We analyzed data from a longitudinal study of Hisp...

Background: Social media present opportunities for public health departments to galvanise interest in health issues. A challenge is creating content that will resonate with target audiences, and determining reactions to educational material. Twitter can be used as a real-time surveillance system to capture individuals' immediate reactions to educa...

The links between discrimination and adjustment in U.S. Latino/a immigrant adolescents is an important but understudied phenomenon. We aimed to investigate the longitudinal associations (across 1 year) among discrimination, prosocial behaviors, and depressive symptoms in U.S. Latino immigrant adolescents using two competing models: associations bet...

Introduction: Emerging adulthood (ages 18 to 25) is characterized by changes in relationships, education, work, and viewpoints on life. The prevalence of substance use also peaks during this period. Among emerging adults, Hispanics have a unique substance use profile, and have been described as a priority population for substance use prevention. C...

We examine whether peer substance use and cultural factors differentially influence the initiation of tobacco, alcohol, and marijuana use in adolescence and emerging adulthood (EA) among a community-based sample of Hispanics. Participants provided data in 11th grade (M = 16.8 years old, SD = 0.54) and emerging adulthood (M = 20.3 years old, SD = 0....

Latino/a youth are at risk for symptoms of depression and cigarette smoking but this risk varies by acculturation and gender. To understand why some youth are at greater risk than others, we identified profiles of diverse community experiences (perceived discrimination, bullying victimization, social support, perceived school safety) and examined a...

Objective: This study explores the presence and actions of an electronic cigarette (e-cigarette) brand, Blu, on Twitter to observe how marketing messages are sent and diffused through the retweet (i.e., message forwarding) functionality. Retweet networks enable messages to reach additional Twitter users beyond the sender's local network. We follow...

All tweet ID's by month and layer. (XLSX)

Previous studies have documented associations between perceptions of racial/ethnic discrimination and adverse health outcomes among Hispanics and other minority groups. However, these studies have not examined change in perceived discrimination over the lifecourse and whether trajectories of perceived discrimination affect outcomes differently. Thi...

Drawing from a theory of bicultural family functioning 2 models were tested to examine the longitudinal effects of acculturation-related variables on adolescent health risk behaviors and depressive symptoms (HRB/DS) mediated by caregiver and adolescent reports of family functioning. One model examined the effects of caregiver-adolescent acculturati...

Latino/a youth are at risk for cigarette smoking. This risk seems to increase as youth navigate the U.S. cultural context, especially for girls. To investigate how acculturation may influence Latino/a youths' intentions to use cigarettes, this study combines a bidimensional/multidomain model of acculturation and the Theory of Reasoned Action. Our s...

This study examined, in a sample of recently immigrated Hispanic adolescents in Miami and Los Angeles, the extent to which bicultural identity integration (BII; involving the ability to synthesise one's heritage and receiving cultural streams and to identify as a member of both cultures) is best understood as a developmental construct that changes...

Background: Tobacco use prevalence rates are high among Spanish adolescents. Programming to counteract tobacco use is needed. Methods and findings: The current study provides a one-year follow-up outcome evaluation of Project EX, an eight-session classroom-based curriculum. The intervention was tested using a randomized controlled trial with 1,5...

This 2½-year, 5-wave longitudinal study tests the hypothesis that acculturation discrepancies between Hispanic immigrant parents and adolescents would lead to compromised family functioning, which would then lead to problematic adolescent outcomes. Recent-immigrant Hispanic parent-adolescent dyads (N = 302) completed measures of acculturation and f...

This study examined longitudinal effects of cultural stress (a latent factor comprised of bicultural stress, ethnic discrimination, and negative context of reception) on depressive symptoms and a range of externalizing behaviors among recently (≤5 years in the U.S. at baseline) immigrated Hispanic adolescents. A sample of 302 adolescents (53% boys;...

Objectives: Social media platforms are used by tobacco companies to promote products. This study examines message content on Twitter from e-cigarette brands and determines if messages about flavors are more likely than non-flavor messages to be passed along to other viewers. Methods: We examined Twitter data from 2 e-cigarette brands and identified...

Emerging adults (ages 18 to 25) who experience multiple role transitions in a short period of time may engage in hard drug use as a maladaptive coping strategy to avoid negative emotions from stress. Given the collectivistic values Hispanics encounter growing up, they may experience additional role transitions due to their group-oriented cultural p...

Despite efforts to prevent smoking, the prevalence of smoking in Spanish adolescents remains high. So far, there are no evidence-based smoking cessation programs for adolescents in Spain. This study describes the evaluation of Project EX, an eight-session school-based clinic smoking cessation program, with Spanish cigarette smokers 13-19years of ag...

The present study was designed to examine acculturative changes, and their effects on mental health and family functioning, in recent-immigrant Hispanic adolescents. A sample of 302 Hispanic adolescents was assessed five times over a 2½-year period. Participants completed measures of Hispanic and U.S. practices, collectivist and individualist value...

Purpose: We sought to determine the extent to which initial levels and over-time trajectories of cultural stressors (discrimination, negative context of reception, and bicultural stress) predicted well-being, internalizing symptoms, conduct problems, and health risk behaviors among recently immigrated Hispanic adolescents. Addressing this research...

Hispanic immigrant youth engage in increased health risk behaviors, such as alcohol misuse, due in part to being confronted with acculturative stress in addition to facing major normative developmental challenges, such as identity consolidation. Using a developmental psychopathology framework, in the present study we examined the effect of bicultur...

Adolescent aggression and delinquency impede healthy adjustment in early adulthood and may have particularly serious long-term consequences for minority youth. Therefore, prevention research should examine these behaviors within a sociocultural framework among newer immigrant samples to determine whether, and how, adaptation to life in the US affec...

Self-identification with ethnic-specific labels may indicate successful ethnic identity formation, which could protect against substance use. Alternatively, it might indicate affiliation with oppositional subcultures, a potential risk factor. This study examined longitudinal associations between ethnic labels and substance use among 1,575 Hispanic...

Using data collected between 2005 and 2012 from a longitudinal study of acculturation patterns and substance use among Hispanic youth in Southern California (N = 2722), we fit multivariate logistic regression models to estimate the association of type and frequency of drug use, friend and parent drug use, cultural orientation (measured by the ARSMA...

Objectives: We examined the coevolution of adolescent friendships and peer influences with respect to their risk behaviors and social networking site use. Methods: Investigators of the Social Network Study collected longitudinal data during fall 2010 and spring 2011 from 10th-grade students in 5 Southern California high schools (n = 1434). We us...

ContextCultural variables have been associated with sexual risk behaviors among Latino youth, but findings across studies are inconsistent.MethodsA longitudinal study of acculturation patterns followed Latino youth in Southern California from 2005 to 2012. Data from 995 participants were used in logistic and ordered regression analyses to test whet...

Context of reception has been discussed widely in the sociological and anthropological literature, but no measures of this construct exist. We designed a measure of perceived context of reception and provide initial support for the factorial validity, internal consistency reliability, and incremental and discriminant validity of scores generated by...