Introduction The world is experiencing an unprecedented health crisis with severe socio-economic consequences due to the COVID-19 pandemic. The disease was declared a pandemic on 11th March 2020 by WHO. Till December 7, it had affected about 69 million people worldwide and taken away about 1.6 million lives.1 In Bangladesh the first case was detected on 8/03/2020. Between 9th March and 7th December 2020, a total of 485,965 COVID-19 confirmed cases were reported including 6,967 related deaths.2 To reduce the tragic loss of life and help get the pandemic under control, along with present interventions like use of face mask, social distancing, hand washing and contact tracing, safe and effective COVID-19 vaccines are also needed. As there is no break-through in the therapeutics, general population
