Watch out for COVID-19 hoaxes that suggest technologies misuse your personal data

One of the most important symptoms of COVID-19 is low oxygenation. To measure the amount of O2 in a human’s blood, scientists have developed the oximeter, a small device that resembles a clothespin and is now being sold everywhere.

When a patient arrives at a health unit, a nurse or a doctor usually clips the oximeter to a finger (or sometimes to an ear) and in a few seconds, sees on a small illuminated screen displaying the percentage of oxygen in the patient’s blood. If it is below the levels...