The app allows users to: * See the alert level of their local authority area (in Wales) or information about restrictions (in England); to enable this, the user must enter the first half of their postcode * "Check in" at places displaying an<unk>  QR code poster (no longer required by legislation after 26 January 2022, removed from the app the next month) * Be notified when they have been in close contact with someone who has tested positive for the virus * Be notified when local health protection teams determine that people with the virus had attended a business or other venue around the same time as the user * Check their symptoms, and book a coronavirus test if necessary * If asked to self-isolate, receive information and a daily "countdown". At first, "close contact" was defined as being within 2 metres for 15 minutes, or within 4 metres for a longer time. These time durations were reduced from 29 October 2020, to as little as three minutes when the other person is at their most infectious, i.e. soon after they begin showing symptoms. Implementation The Android app is coded in Kotlin, and the iOS app in Swift. The backend uses Java and is deployed to Amazon Web Services using Terraform. The code of the app and back-end is open-source and available on GitHub.
NHS COVID-19
Rapid Reviews: COVID-19
FACE AIDS
Long COVID
AIDSVAX
Zero-COVID
Oral polio vaccine AIDS hypothesis
Fever hospital