Unvaccinated persons are at greater risk of mortality from COVID-19 going by the findings of certain scientific studies but data on deaths due to coronavirus infection with respect to their vaccination status is not maintained centrally, the government informed Lok Sabha on Friday. Minister of State for Health Bharati Pravin Pawar was responding to a question on whether the government is aware that around 75 per cent deaths during the recent Omicron wave of Covid were of unvaccinated persons.