The Serum Institute of India has responded to "malicious and misconceived" allegations by preparing a Rs100 crore defamation suit against a Covishield coronavirus vaccine trial participant who claimed to suffer a "virtual neurological breakdown" after being administered a dose, reports NDTV.

A court here on Thursday summoned former shipping minister Shajahan Khan in a defamation case filed by Nirapad Sarak Chai founder Ilias Kanchan.