Amidst rising instances of children testing positive for Covid-19, a ray of hope has emerged as the vaccine 'ZyCoV-D' by Zydus Cadilla got approval to be administered to children above 12 years of age. However, the use of the vaccine and its associated guidelines are yet to be released by the Central government, informed Directorate of Medical Education and Training (DMET) Chief, CBK Mohanty on Saturday (Aug 21).