After the alleged death of a volunteer enrolled in Bharat Biotech's Covaxin clinical trial in Bhopal, the Hyderabad-based company clarified on Saturday that the death was unrelated to the vaccine and the probable cause of death was cardio respiratory failure as a result of suspected poisoning.

"As per the post-mortem report issued by the Gandhi Medical College, Bhopal, that the site received from the Bhopal Police, the probable cause of death was due to cardio respiratory failure as a result of suspected poisoning and the case is under police investigation as well," Bharat Biotech said in a statement.