My husband took the first shot of covaxin on 3rd may. However soon he had to leave for work to Riyadh . He is due to come back end July and go back again within a month.But covaxin is nit not an accepted vaccine in Saudi like in several other countries. I wanted to know if it is possible for him on get first shot of Covishield / sputnik once he is back despite having taken the first shot of covaxin already?