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Bob flies from Ireland to Cheltenham in the UK to visit the Cheltenham Gold Cup. While there he mixes with about 60,000 other visitors to the races, along with

• chimprich 7y ago
  I think those gatherings are a thing of the past in most countries. But in practice I don't think you'd have that many notifications (there's not that many people you'd stand next to for, say, 5 minutes within 1 metre) and they could all be true positives.