This clinical trial is a randomized, blinded, two arms, placebo controlled, clinical trial to evaluate the safety and efficacy of Mycobacterium w in combination with standard care as per hospital practice to prevent COVID 19 in subjects at risk of getting infected with COVID 19.

Approximately eligible 4000 subjects who are at risk of getting infected with COVID-19 (i.e. person living in same household as COVID-19 patients / healthcare workers providing direct care to COVID-19 patients) will be enrolled in to the study after due consent and based on the eligibility criteria.

Initially, 400 subjects at risk of getting infected with COVID-19 will be enrolled in the study and randomized in 1:1 ratio to receive either Mw (n=200) or placebo (n=200). After the interim analysis from the data of these 400 subjects for safety and efficacy and based on review and recommendations from DSMB / MC, modification in study design, objective or sample size will be considered.

Study duration for each subject will be of 8 weeks.

Inclusion Criteria:

• Healthy subjects of either gender, age ≥ 18 years, with recent history of close contact with COVID-19 patients.
• Subjects with SARS Cov 2 negative test (ICMR approved test kit) at screening visit.
• Female subject who are currently using reliable methods of contraception (barrier methods and intrauterine contraceptive device), with a negative urine pregnancy test during screening and agree to informed compliance of contraceptive method until at least months post-dosing.
• The subject must be able and willing to comply with the study protocol, available and willing to complete all the study assessments and must have signed an Informed Consent Form.

Exclusion Criteria:

• Any febrile illness with oral temperature > 100°F within 3 days prior to randomization.
• Subject with past history of COVID-19 infection.
• Pregnant and / or lactating female subjects.
• Presence of any illness requiring hospital referral.
• Any confirmed or suspected immune-deficient condition based on medical history and physical examination and a family history of congenital or hereditary immunodeficiency or Individuals on immunosuppressant's as Azathioprine, Cyclosporine, Mycophenolate etc.
• History of allergic reactions or anaphylaxis to Mw or its component.