23rd April 2008 turned into the Black Wednesday. At Venkatapuram village and Pennaloorpettai of the Thiruvallur district, four Dalit children died shortly after vaccination. The children were given injection for immunization against measles at the weekly camp for Immunization Program. They, however, resulted to be suffered spasms, and frothing at their mouths. The victimized children were buried without proper autopsy.
The Tamil Nadu Government immediately suspended Village Health Nurse (VHN) who had administered the vaccine.