UC Irvine researchers created a free smartphone app, dubbed TrackCOVID, which develops an anonymous graph of interactions by pooling user data every time an individual gathers with others or goes to a public place. App users can log their interactions and "checkpoints", or places visited, and the app anonymously links users' interactions as they congregate in the same places over time. Individuals who test positive for COVID-19 can anonymously report it through the app, which will notify users who may be at risk of exposure based on the graph of interactions. Read More