Serum Institute of India and Bharat Biotech have released fact-sheet and other details about who all cannot take the Covid shot. On FYI, we will examine this list. We also ask experts if the vaccine is safe for diabetes patients, those on blood thinners and those categories are immunocompromised. Those who have weaker immunity or are on a medicine that affects their immune system and people with allergies must not take the Covaxin shot, vaccine-makers Bharat Biotech warned on Monday.