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The move is aimed at preventing misuse by those who have not booked a slot, whenever the right person does not show up for the dose.
The pin will ensure that only people who had booked the appointment get the vaccine shots.
The new feature will be effective from May 8 and will only be applicable to citizens who have booked a vaccination slot online.
“It has been noticed in some instances that citizens that had booked their appointment for Covid-19 vaccination through the CoWin portal – but did not actually go for vaccination on the scheduled date – have received notification through SMS that a vaccine dose has been administered to them,” the government said in a statement.
“Upon examination, it has been found to occur largely on account of the vaccinator wrongly marking the citizen as vaccinated — an instance of a data entry error by the vaccinator.”
The “4-digit security code” will be printed in the appointment acknowledgement slip and will not be known to the vaccinator.
The code will also be sent to the beneficiary in the confirmation SMS after successful booking of appointment. The appointment acknowledgement slip can be saved on the mobile phone and shown to the vaccinator.
The move ensures that data entries regarding vaccination status of citizens who book an online appointment are recorded correctly and will also reduce chances of impersonation and wrongful use of the flexibility provided by the portal for facilitating vaccination coverage, the government said.