Also Read | The race to take fashion retail onlineWith the COVID-19 vaccine expected to be rolled out within a few days, Guleria answered some FAQs about the vaccination drive in a video uploaded on the health ministry's website.He responded to questions such as whether taking the coronavirus vaccine was mandatory, how long does it take for the antibodies to develop and if it was necessary for a COVID-recovered person to take the vaccine.He said while getting inoculated against COVID-19 will be voluntary, it is advisable to receive the complete schedule of the vaccine irrespective of past history of infection as this will help develop better immune response against the disease. "Vaccination for COVID-19 is voluntary.