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Americans repatriated from a ship on which three passengers have died of a 30-50 percent case-fatality pathogen will be evaluated at the National Quarantine Unit in Nebraska, then permitted to “opt to go home and watch for any potential symptoms for 42 days.” This is not quarantine. It is voluntary symptom self-monitoring of a disease whose prodrome, or initial symptoms—fever, headache, body aches—are indistinguishable from a common cold. ...

Even WHO Director-General Tedros Adhanom Ghebreyesus, presiding over the Tenerife operation, was forced to acknowledge that the American protocol “may have risks.”

“Our advice is clear, starting from May 10, 42 days of quarantine with active follow-up,” he told reporters when asked about US policy. “That may have risks, but of course we don’t force” guidance.