for people ages 13 years and up (full criteria)
Healthy Volunteers
healthy people welcome
at San Diego, California
study started
estimated completion
Principal Investigator
by Richard S Garfein, PhD, MPH
Photo of Richard S Garfein
Richard S Garfein



The three-month short-course treatment with isoniazid [H] and rifapentine [P] (3HP) recently recommended by the Centers for Disease Control and Prevention could dramatically increase the number of persons starting and completing treatment for latent tuberculosis infection (LTBI), but TB providers nationwide are hamstrung by the requirement that 3HP only be administered by directly observed therapy (DOT) in which patients are watched taking each medication dose in-person. We developed a novel mHealth application that allows patients to make and send videos of each medication dose ingested that are watched by healthcare providers via a HIPAA-compliant website to remotely monitor LTBI treatment adherence (Video DOT [VDOT]). This study will determine whether monitoring patients with VDOT achieves higher treatment completion rates and greater patient acceptability at lower cost than clinic-based in-person DOT.

Official Title

Video Directly Observed Therapy (VDOT) to Monitor Short-Course LTBI Treatment


Building on our novel VDOT System that includes text messaging reminders and HIPAA-compliant cloud-based administration, we hypothesize that VDOT can be expanded to provide higher treatment completion rates at a lower cost than in-person DOT for LTBI treatment using 3HP. We propose a randomized controlled trial to address the following specific aims: Aim 1: To determine whether LTBI treatment completion and adherence are greater for patients treated with 3HP administered via VDOT versus in-person DOT, and to identify patient factors associated with these outcomes; Aim 2: To compare acceptability of treatment by patients on VDOT versus in-person DOT, and identify factors associated with differences in acceptability; Aim 3: To calculate the cost-effectiveness of VDOT compared to in-person DOT for administering 3HP. To address the study aims we will conduct a randomized controlled trial in which TB contacts and refugees in San Diego who are prescribed 3HP for LTBI treatment by their physician will be randomly assigned to be monitored for adherence via either VDOT or in-person DOT (Figure 2). Approximately 100 patients per year over three years (n=155/arm) will be recruited through the San Diego County TB Control and Refugee Health Program (TCRHP) clinics for the trial. Patients assigned to VDOT will be given a smartphone with service and taught to send videos of themselves taking each weekly medication dose; patients in the in-person DOT arm will visit the clinic each week to be observed by a healthcare worker taking their LTBI medication. Medication adherence will be monitored for all participants until they have taken all 12 doses or 16 weeks (limit recommended by the CDC to complete treatment), to compare treatment adherence rates and patient acceptance across trial arms. Participants will complete brief (20 minute) baseline and follow-up assessment interviews to obtain information about potential confounders and effect modifiers of adherence and patient acceptance regarding their treatment administration method. Cost-benefit analyses will also be conducted to assist in developing policies around the use of VDOT for 3HP. Since participants will be recruited after they have been prescribed 3HP by their healthcare provider and all patient care will be continued through their provider, no medications will be prescribed or treatment decisions made this study.


Tuberculosis Latent Tuberculosis Infection Telemedicine Mobile Phone Adherence Directly Observed Therapy Video DOT Latent Tuberculosis Video Directly Observed Therapy In-Person DOT


You can join if…

Open to people ages 13 years and up

  1. Diagnosis of LTBI and patient's physician determines that they are eligible to receive 3HP
  2. Age ≥13 years;
  3. No plans to move out of the San Diego area within 4 months of enrollment; and
  4. Willing to comply with study procedures and provide informed consent (or assent for minors and parental consent) prior to study enrollment.

You CAN'T join if...

  1. Are younger than 13 years old;
  2. Plan to move out of San Diego County within 4 months of enrollment;
  3. Refuse to allow study staff to review their medical records;
  4. Are incarcerated;
  5. Have a physical (e.g., blindness) or cognitive disabilities that make VDOT impractical unless someone else in their household can assist them for the duration of the study; or
  6. Are using other medications that preclude the use of 3HP (e.g., antiretroviral medication for HIV).


  • San Diego County Health and Human Services Agency accepting new patients
    San Diego California 92110 United States

Lead Scientist at UCSD


accepting new patients
Start Date
Completion Date
University of California, San Diego
Study Type
Last Updated