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Two different types of HIV have been identified in humans: HIV-1 and HIV-2.
Both types of HIV are acquired sexually. Both cause AIDS.
HIV-1 appears to be more virulent that HIV 2.
HIV-1 is most commonly found in the United States, Canada and Europe. HIV-2 has been primarily found in Africa.
Other differences between HIV-1 and HIV-2 are:
- HIV-2 appears to be less easily transmitted
- Those with HIV-2 are less infectious early in the course of the infection
- The period between initial infection and illness is longer in HIV-2, meaning that those with HIV-2 will show slower deterioration of the immune system
- As the disease advances, HIV-2 infectiousness seems to increase
- HIV-2 seems to be less transmissible from an infected mother to her child
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