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There have also been reports in East African newspapers of addicts selling their blood, but those have not been confirmed by medical researchers.

And, there have been scattered reports of flashblood-type practices in other countries with large numbers of heroin addicts, including Pakistan, but they also have not been confirmed by researchers.

Whether or not someone can actually a get drug rush from such a relatively tiny amount of blood has never been tested, Dr. McCurdy said. Humans have about five quarts of blood and the flashblood-user injects less than a teaspoon.

“They say they do,” she said. “They pass out as if they just got a high. But I’ve talked to doctors who say that could be entirely the placebo effect.”

One possibility, she said, is that traces of the drug are still in the syringe. After piercing a vein, an addict will typically draw some blood into the syringe, push it back out and repeat that three or four times to make sure all the heroin has been flushed into their blood. Those offering flashblood will usually hand over the syringe after only one in-out cycle.

The heroin sold in East Africa, she added, is often quite strong because it has come from relatively pure shipments on their way to Europe from Afghanistan or Asia.

Until recently, heroin use was uncommon on the continent because most Africans are too poor for traffickers to bother with. But in the last decade, smugglers have begun using port cities like Dar es Salaam and Mombasa and airport cities like Nairobi and Johannesburg as way stations on their routes: law-enforcement officials can often be bribed, and couriers from countries with no history of drug smuggling may escape searches by European border officers. The couriers may be paid in drugs, which they resell.

With more local users, more heroin is being sold in Africa. In the last decade, law-enforcement and drug treatment agencies said, heroin use has increased, especially in Kenya and Tanzania, South Africa and Nigeria. Brown heroin that must be heated and inhaled — “chasing the dragon” — has given way to water-soluble white heroin that can be injected. Prices have fallen by as much as 90 percent.

While a teaspoon of blood is more than enough to transfer diseases like AIDS, said Dr. James AuBuchon, president-elect of the American Association of Blood Banks, it would not be enough to cause a life-threatening immune reaction, as can ensue when a patient gets a transfusion from someone of the wrong blood type. Instead, “you’d likely get only brief symptoms,” he said.

Dr. AuBuchon, who practices in Seattle, said he had never heard of flashblood, but added that he was horrified by the idea.

“What,” he asked, “are they thinking?”

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