Final answer:
HIV-2 is concentrated in West Africa and progresses more slowly than HIV-1. It is less easily transmitted and less common than HIV-1.
Step-by-step explanation:
HIV-2 differs from HIV-1 in a number of properties. One major difference is that HIV-2 is concentrated in West Africa, while HIV-1 is found worldwide. HIV-2 is less common and typically progresses more slowly than HIV-1. Additionally, HIV-2 is less easily transmitted than HIV-1. Overall, these differences contribute to variations in the global distribution, transmission, and progression of HIV-2 compared to HIV-1.