Maintaining treatment fidelity when implementing evidence-based interventions is a significant challenge. The inability to deliver in-person services due to the COVID-19 pandemic critically challenged the foundation of implementation fidelity for home visiting programs across the globe. The Attachment and Biobehavioral Catch-Up (ABC) program is an evidence-based home visiting intervention designed to increase sensitivity in parents of infants who have experienced early adversity. ABC's community effectiveness is due to rigorous fidelity monitoring and supervision. Fidelity is measured by microanalytic coding of parenting opportunities and "in-the-moment" commenting, the active ingredient of ABC. In this study, we examined intervention fidelity among parent coaches implementing ABC through telehealth. Random 5-min clips from 510 telehealth ABC session videos conducted by 91 parent coaches at 48 agencies were coded for their frequency and quality of in-the-moment comments. On average, parent coaches were able to exceed in-person commenting fidelity standards when implementing ABC through the telehealth format. The active fidelity monitoring and supervision inherent to ABC's dissemination afforded a smooth transition to implementing ABC through telehealth while adhering to fidelity standards.Procedural and clinical challenges to telehealth implementation are discussed, along with future directions for telehealth program effectiveness.

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