India this morning reported 48,698 new COVID-19 cases and 1,183 deaths in 24 hours (File) New Delhi: Mixing Covid vaccines - which some data suggests could generate better immunity or more antibodies - is a "definite possibility" but more information is needed before a decision can be taken, AIIMS chief Dr Randeep Guleria told NDTV on Saturday morning. "This is something that has been looked at in the past - giving one vaccine as the priming shot and another as the booster. Some data suggests mixing vaccines leads to slightly higher side effects, but other data suggests it may lead to better immunity and antibody protection," Dr Guleria said.