"By putting his picture on my certificate, he's intruding into the private space of citizens. It's unconstitutional and I'm requesting the honourable prime minister to stop this wrong, shameful act immediately," Mr Peter told the BBC on the phone from his home in Kottayam district. "It's inappropriate in a democracy and of absolutely no use to the nation or any individual," he added.
Besides the personal details of the individual, vaccine certificates issued by the Indian health ministry carry Mr Modi's photograph along with two messages in English and local languages.