- 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.

- 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.