I had an interesting experience exiting Customs today. There were some folks from CDC who were asking folks to volunteer to do nasal swabs, to test for Covid, flu, and RSV. They asked where we'd been, where we lived in the US, if we'd had the relevant vaccines (they seemed surprised we'd had the RSV shot), and if we'd ever had Covid (nope!). They did not ask for any PII—this was apparently a sampling technique to see if folks are bringing viruses in.And to thank us, they handed us some Covid test kits.