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Virus Strain Aug 31, 2008 How does one tell what HIV virus strain they have? How many virus strains are there? Thank You. |
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| Response from Dr. Holodniy
 HIV is divided into several subtypes, labeled with letters. Subtype B is the most common in the U.S. Within a person the virus can have multiple substrains or quasi-species, which can also be different in different tissues. The major subtype of virus can be determined by certain kinds of lab tests. Determining what kinds and how many quasi-species a person has requires very sophisticated testing done in research labs. | ||||||||
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