The updated policy encouraged health officials to be more transparent with their communities about the tracking, one of many changes sought by H.I.V. advocacy organizations concerned about how so-called molecular surveillance could violate patients' privacy and civil rights.
H.I.V. has a distinctive genetic signature in each person that helps doctors decide which drugs are likely to thwart it. But the information can also be used to track its spread through a population - including identifying clusters of people who carry closely related viruses.
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