Contract Tracing: What Bluetooth Low Energy (BLE) Thresholds Is Everbridge Using to Define an Exposure Event (When a Self-Reporter Comes Into Bluetooth Proximity to a Non-infected End-User)?

Environment:

Apple iOS
Google Android

Question:

What Bluetooth Low Energy (BLE) thresholds is Everbridge using to define an Exposure Event (when a Self-Reporter comes into Bluetooth proximity to a non-infected end-user)?

Answer:

Both Distance and Duration BLE thresholds must be met to trigger an Exposure Event.

  • Distance: 6 feet
  • Duration: 15 minutes

Please note that the 6 feet / 15-minute thresholds are derived from the BLE signal strength connection between two devices and both thresholds may vary slightly depending on a number of factors including obstacles between the devices, device models, and OS versions.

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