Why There Are Calls To Reduce Gap Between Two Doses Of Covishield Vaccine In India. In mid-May, the Indian govt increased the gap between two doses of Covishield vaccine to 12-16 weeks. But, around the same time, the UK cut the gap for jabs for certain populations from 12 to 8 weeks. The decision to reduce the gap between two jabs in the UK was taken after finding that the newer variants could blunt the effect of vaccines. Watch the video to know more.