The centre has said Covishield's second dose will be given after 12-16 weeks instead of the previous 6-8 weeks. This is the third revision in COVID-19 dosage regimen for Covishield. The centre said those who have recovered from Covid can get vaccinated after six months, while the World Health Organisation says 4-6 weeks. Is the change in policy driven by vaccine shortage or science? Experts from India and the UK answer.
