Expanding access to children's mental health care is a critically important global health challenge. Twenty percent of all children suffer from significant mental health concerns, most of whom will remain unrecognized, unsupported and affected throughout their lives. In India and low and middle income countries (LMICs), the burden of children's mental illness is particularly heavy due to large populations with high proportions of children and adolescents, high rates of adverse childhood events and poverty, limited resources to care for children and under-recognition of their mental health struggles. Despite prevalence rates in India estimated to be on the high end of the global burden, less than 1% of Indian children and adolescents with mental health struggles are receiving treatment. The need to address this care gap is further intensified by the adverse impact of the ongoing Covid-19 pandemic. Task-shifting of mental health care tasks to non-specialist providers and lay individuals in LMICs has been shown repeatedly to increase access to care and improve mental health outcomes; it represents a promising approach to delivery of child mental healthcare. However, alternative models for children's mental healthcare, including task-shifting, are rare and reflect several significant barriers. Provision of such care occurring in the context of children's evolving cognitive and emotion-recognition abilities requires knowledge of and experience in child development. Furthermore, given limited funding and few professional providers for children's mental health, sustainable care models likely need to leverage existing systems and require few or no additional human resources. With relevant professional experience and consistent access to children within existing education systems, teachers are uniquely positioned to address these barriers and deliver care to children. School-based mental health interventions are commonly conceptualized using the Multi-Tiered Systems of Support (MTSS) framework which defines three levels of support corresponding with Tier 1(promotion), Tier 2 (prevention), and Tier 3 (intervention \& treatment). Several studies have demonstrated that teachers can successfully deliver whole-school or whole-class-based interventions targeting universal mental health prevention and promotion in resource-constrained settings. Far fewer efforts though have been undertaken to evaluate the possibility of Tier 3 interventions in which teachers directly provide care to select children-in-need. Teachers in an HIC have been able to feasibly deliver a subset of therapeutic techniques to children diagnosed with Conduct Disorder and an ongoing study in Kenya has shown teacher-delivered Trauma-focused-Cognitive Behavioral Therapy for children who have experienced parental death is feasible and acceptable. While these studies suggest promise for teacher-delivered indicated care, teachers in these handful of studies delivered prescribed, manualized care. While such a structure is at the heart of task-shifted care for adults and adolescents, it differs from the typical Tier 1 and Tier 2 structure that is either whole-school or whole-class-based.6 It may be that few interventions study teachers delivering Tier 3 care as the typical Tier 3 structure, predominantly one-on-one sessions, is not conducive to teachers delivering care on top of their typical duties. Further, the care in these studies focuses on singular diagnoses, limiting the teacher-lay counselors' reach. Given the limited time teacher-lay counselors would have to deliver indicated care, a transdiagnostic approach would maximize the children and categories of struggles teachers could reach while potentially minimizing the amount of training teachers would need to deliver such care.

To address this gap, the research team has developed a novel intervention, Tealeaf, to task-shift to to teachers the delivery of care to indicated school-aged children facing mental distress. Tealeaf is unique in that teachers deliver care utilizing a trans-diagnostic, non-manualized, evidence-based approach that they can customize and integrate into their existing workflows. In work preceding this trial, members of this research group conducted studies in rural Darjeeling to assess the feasibility, acceptability and potential efficacy of Tealeaf.

Through this work, the research team has documented an emergent therapy modality that they have called "education as mental health therapy" (Ed-MH). Ed-MH relies on teachers shifting their professional practice to incorporate mental health techniques into their workflow with the primary goal of improving individual children's mental wellbeing. Transdiagnostic, indicated mental health care that is primarily incorporated into existing workflows is feasible for teachers to deliver and acceptable to teachers, caregivers, and children. Further, the research team has established strong face validity for the efficacy of Tealeaf. Children receiving this care have consistently demonstrated significant improvement in their mental health from baseline and an (ad-hoc) showed substantial/significant impact for children receiving Tealeaf as compared to Enhanced Usual Care \[publication forthcoming\]. Finally, the potential risks associated with Tealeaf have been well evaluated and no serious adverse events have occurred over multiple years of piloting. Overall, the research team's prior research demonstrates that teacher-delivered transdiagnostic mental health care (Ed-MH) may be a potentially efficient, sustainable, and impactful approach. The research team believes the next logical step is to assess the effectiveness of this care model through real-world implementation. To accomplish this, with funding support from the Mariwala Health Initiative, the research team will conduct a hybrid three-variable hybrid study of effectiveness, implementation, and context. Evaluating intervention effectiveness, implementation processes and outcomes, and the context in which it occurs will generate valuable insight into how children's mental health care can best be delivered in resource-limited settings.