Photo/Illutration Health center officials in Tokyo’s Ota Ward are busy with tasks related to COVID-19 on April 21. (Asahi Shimbun file photo)

The Tokyo metropolitan government has shifted from accepting COVID-19 patient data by fax, pivoting to using an online data management system after it discovered data errors stemming from a mountain of paperwork that was not cross-checked.

Tokyo started using the new online system because each local health center was reporting its data via fax, but failed to first check it with the metropolitan government, resulting in multiple counts of the same patient and other mistakes.

Tokyo discovered missing reports of 111 infected patients and overlapping counts for 35 people in its tally, according to officials.

Those kinds of errors can pose major problems for policy makers, who are basing their countermeasures against COVID-19 on that data.

Of the 31 health centers in Tokyo, six are in the Tama region and the island area, operated by Tokyo, while the rest are run by 23 wards and two cities.

After confirming their new cases, the 31 health centers would fax the reports that included names, symptoms and infection routes, to Tokyo’s Social Welfare and Public Health Bureau, which is in charge of the tallying.

As many people were confirmed infected with the virus, a tremendous amount of paperwork was faxed to the bureau, sources said.

However, the bureau and the health centers did not verify the data via telephone or e-mail each other.

In one case, the same infected patients were reported by fax multiple times. One infection case was counted three times in the final tally.

There was also no standardized format for how health centers reported deaths from the coronavirus to the bureau.

The Tokyo metropolitan government started using its own information sharing system full scale on May 12 to remedy the situation, it said, which allows it to better share data with heath centers.

The health centers can now input their data on infected patients by computer.

Tokyo’s bureau can also check the information in real time using the new system.

(This article was written by Chiaki Ogihara and Yusuke Nagano.)