Breakdown of Test and Protect self-isolation numbers: FOI release

Information requested

1. How many individual app users have been alerted that they have been in close contact with another app user who tested positive for coronavirus in the period 29 November to 26 December?

2. What proportion of those alerted subsequently tested positive for Coronavirus?

3. How many individual app users have been alerted that they have been in close contact with another app user who tested positive for coronavirus in the period 22 November to 26 December per day?

4. What proportion of those alerted subsequently tested positive for Coronavirus?

Response

While our aim is to provide information whenever possible, in this instance the Scottish Government does not have some of the information you have requested, specifically we are unable to answer questions two and question four. The reasons why we don't have the information are explained below.

1. It is not possible to determine how many individuals have been alerted from data held by the Scottish Government as each individual may have the Protect Scotland app installed on multiple devices, and therefore receive more than one notification. It is possible to determine the number of contact notifications issued to unique devices during this period, which was 20,192.

2. The Protect Scotland App is completely anonymous and has been created with privacy by design. As a result it is not possible to determine the proportion of the 20,192 contact notifications that could then be attributed to a subsequent positive test for COVID-19.

3. It is not possible to determine how many individuals have been alerted from data held by the Scottish Government as each individual may have the Protect Scotland app installed on multiple devices, and therefore receive more than one notification. It is possible to determine the number of contact notifications issued on a daily basis to unique devices, this information is set out in the table below:

Date	Contact Notifications (Daily)		Date	Contact Notifications (Daily)
22 November 2021	482		10 December 2021	542
23 November 2021	490		11 December 2021	581
24 November 2021	490		12 December 2021	717
25 November 2021	375		13 December 2021	761
26 November 2021	304		14 December 2021	905
27 November 2021	310		15 December 2021	1,126
28 November 2021	261		16 December 2021	842
29 November 2021	479		17 December 2021	952
30 November 2021	419		18 December 2021	891
01 December 2021	412		19 December 2021	929
02 December 2021	371		20 December 2021	896
03 December 2021	225		21 December 2021	856
04 December 2021	317		22 December 2021	1,069
05 December 2021	424		23 December 2021	943
06 December 2021	485		24 December 2021	933
07 December 2021	427		25 December 2021	935
08 December 2021	693		26 December 2021	1,325
09 December 2021	737

4. As set out in response to question two, the Protect Scotland App is completely anonymous and has been created with privacy by design. As a result it is not possible to determine the proportion of the contact notifications in the table above that could then be attributed to a subsequent positive test for COVID-19.

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