About 37 million people worldwide are currently infected with HIV [File: Marco Bello/Reuters]

A bone marrow stem cell transplant has led to a patient with human immunodeficiency virus (HIV) going into long-term remission, meaning he might become the second person to be cured of the infection.

Although the patient has been in remission for 18 months, the authors of the British study published on Tuesday in the science journal Nature cautioned it was too early to say he had been cured.

Almost three years after receiving bone marrow stem cells from a donor with a rare genetic mutation

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