Odisha Health Minister Naba Kishore Das on Monday wrote a letter to the Union Health Minister Dr. Harsh Vardhan to allocate additional doses of Covishield. The State minister has sought 6 lakh doses for the month of June to manage the Covid19 vaccination sessions at different centres. In the letter to the Union Minister, Naba Kishore Das also requested the Centre to pre-position vaccine doses in advance to prevent any possible event of stock-out in state