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Perhaps then, being an author is just in one's blood.

A device known as a pulse oximeter, which can measure the oxygen levels in one's blood within seconds after being clipped to one's finger or another body part, is becoming a hot new commodity during the coronavirus pandemic.

Having the right antibodies to the virus in one’s blood — a potential marker of immunity — may soon determine who gets to work and who does not, who is locked down and who is free.

Once one gets the virus in one's blood, it's likely to break out any time.

It was I who built up for her the dream pictures of England—the England of my childhood—the London which, once it is in one's blood, is there forever.