[walterbell]

For Covid-19, there are county and state databases which can record people who test positive, and their "contact traces" (e.g. people you spent more than 15 minutes within 6 feet). Not much is known about the federal health surveillance system, but it includes Palantir, who have also worked with the Census Bureau, https://www.theverge.com/2020/4/21/21230453/palantir-coronav...

[vinay427]

I'm not entirely sure what your point is. Tracking individuals affected by an ongoing situation is rather different, and seems to be the norm in most countries that are responding to the virus including the one where I live. Most seem to have more centralization than in the US, where states almost exclusively mediate the measures taken to reduce spread, etc.