I got a weird call this weekend. That’s nothing special — my phone blows up with robocalls all day every day, just like everyone else’s — but the caller ID for this call caught my eye. It said “Cdc Natl Immun.” I thought about it for a second, then silenced it, assuming it was just another Covid-19 scam call. Because, really, does the CDC show up like that on caller ID? Seemed shady.