The Infection That's Silently Killing Coronavirus Patients

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Important info - one is able to monitor oxygen levels with a pulse oximeter, easily purchased at any pharmacy:

"There is a way we could identify more patients who have Covid pneumonia sooner and treat them more effectively — and it would not require waiting for a coronavirus test at a hospital or doctor’s office. It requires detecting silent hypoxia early through a common medical device that can be purchased without a prescription at most pharmacies: a pulse oximeter."