BCG Vaccine for Health Care Workers as Defense Against COVID 19 (BADAS)
Clara Health

BCG Vaccine for Health Care Workers as Defense Against COVID 19

Sponsored by the National Cancer Institute (NCI)

SARS-CoV-2 spreads rapidly throughout the world. A large epidemic would seriously challenge the available hospital capacity, and this would be augmented by infection of healthcare workers (HCW). Strategies to prevent infection and disease severity of HCW are, therefore, desperately needed to safeguard continuous patient care. Bacille Calmette-Guérin (BCG) is a vaccine against tuberculosis, with protective non-specific effects against other respiratory tract infections in in vitro and in vivo studies, and reported morbidity and mortality reductions as high as 70%.

Furthermore, in our preliminary analysis, areas with existing BCG vaccination programs appear to have lower incidence and mortality from COVID191. The investigators hypothesize that BCG vaccination can reduce HCW infection and disease severity during the epidemic phase of SARS-CoV-2.


Coronavirus disease 2019 (COVID-19) is a respiratory illness that can spread from person to person. The virus that causes COVID-19 is a novel coronavirus that was first identified during an investigation into an outbreak in Wuhan, China.

How is this study designed?

Study type: Interventional (Clinical Trial) Estimated Enrollment: 1800 participants Official Title: Bacillus Calmette-Guerin Vaccination as Defense Against SARS-CoV-2: A Randomized Controlled Trial to Protect Health Care Workers by Enhanced Trained Immune Responses Actual Study Start Date: April 20, 2020 Estimated Study Completion Date: November 2021

Who is this study for?

Inclusion Criteria*:

  • Adult (≥18 years)
  • Male or female
  • Hospital personnel taking care for patients with known or suspected SARS-CoV-2 infection and providing, on average, at least 25 hours per week of direct patient care

* Additional criteria apply. Please speak with the study team for further information.

What should I expect?

Medical history will be obtained from patient medical record/clinical chart. Informed Consent will be obtained to access these records. When information cannot be obtained or is not available from the patient medical record/clinical chart, it will be obtained via patient interview. Physical examination will be conducted solely to look for existing BCG vaccination scars.

Symptom evaluation will be conducted via an electronic survey administered to participants every 1-3 days.

Data will be collected at four time points/periods: (1) after consent, (2) at baseline, (3) during follow-up period, and (4) at study end.

Connect with the study team

Thank you for your interest in advancing COVID-19 treatments.

Please fill out this contact form to be connected to a member of the study team. The following information that you enter will only be authorized to be shared with the research team conducting this specific study.

If you have any difficulties or questions, please contact our support specialists at [email protected]

Have a question?

For general questions about COVID-19 clinical trials, please email [email protected] For study specific inquiries, submit the interest form and you’ll be connected to the study team.