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What are the types of human immunodeficiency virus (HIV)?

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There are two main types of human immunodeficiency virus (HIV) -- HIV-1 and HIV-2. Both can lead to AIDS. However, they're very different from each other.

HIV-1 is the most common type. When you hear the term "HIV," it's probably HIV-1.

HIV-2 occurs in a much smaller number of people, mostly in West Africa. In the U.S., it makes up only 0.01% of all HIV cases, and those are primarily people from West Africa. It's harder to transmit HIV-2 from person to person, and it takes longer for the infection to turn into AIDS.

From: Types and Strains of HIV WebMD Medical Reference

AIDSinfo: "HIV-1."

AVERT: "HIV Strains and Types."

CDC: "Morbidity and Mortality Report: HIV-2 Infection Surveillance --- United States, 1987--2009," "Infection with more than one HIV type (superinfection)."

HIV Sequence Database: "HIV and SIV Nomenclature."

Minnesota Department of Health: "HIV Drug Resistance and Subtype Testing: Information for Clients."

Motomura, K. , 2008. Journal of Virology

Nyamweya, S. , 2013. Reviews in Medical Virology

Plantier, J. , 2009. Nature Medicine

Public Library of Science: "The Two-Phase Emergence of Non-Pandemic HIV-1 Group O in Cameroon."

U.S. Department of Veterans Affairs: "Laboratory Tests and HIV."

University of California San Francisco Center for AIDS Prevention Studies: "What do we know about HIV superinfection?"

Reviewed by Minesh Khatri on August 14, 2018

AIDSinfo: "HIV-1."

AVERT: "HIV Strains and Types."

CDC: "Morbidity and Mortality Report: HIV-2 Infection Surveillance --- United States, 1987--2009," "Infection with more than one HIV type (superinfection)."

HIV Sequence Database: "HIV and SIV Nomenclature."

Minnesota Department of Health: "HIV Drug Resistance and Subtype Testing: Information for Clients."

Motomura, K. , 2008. Journal of Virology

Nyamweya, S. , 2013. Reviews in Medical Virology

Plantier, J. , 2009. Nature Medicine

Public Library of Science: "The Two-Phase Emergence of Non-Pandemic HIV-1 Group O in Cameroon."

U.S. Department of Veterans Affairs: "Laboratory Tests and HIV."

University of California San Francisco Center for AIDS Prevention Studies: "What do we know about HIV superinfection?"

Reviewed by Minesh Khatri on August 14, 2018

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What is group M (Major) of the human immunodeficiency virus-1 (HIV-1)?

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