Health Ministry has applied filters in its Co-Win platform in poll-going states and a union territory to exclude the picture of the prime minister from the COVID-19 vaccine certificates, sources said on Thursday.In a letter to the Election Commission on March 9, Union Health Secretary Rajesh Bhushan is learnt to have said that "technical measures to comply with the directions of EC have been explored promptly.""Necessary filters" in Co-WIN have been applied for the vaccination centres situated in the four states of Assam, Kerala, Tamil Nadu, West Bengal and Union Territory of Puducherry, as suggested by the Commission.Following a complaint by the Trinamool Congress, the Commission had asked the health ministry to follow the model code in.