A total of about 15,000 older adults in Japan have been vaccinated against the novel coronavirus, more than double the number released by the health ministry, a Kyodo News survey showed Sunday.

The discrepancy casts doubt on the ability of the government's new digitalized system launched last Monday as part of efforts to gather and manage individual inoculation data across the country in line with the start of the vaccination program for those aged 65 or older.

The Ministry of Health, Labor and Welfare has said a total of about 6,700 older people have so far received vaccine shots across Japan since the government started inoculations for about 36 million seniors last Monday.