Final answer:
The percentage of HIV cases caused by different pathways varies across different regions.
Step-by-step explanation:
According to the provided information, the percentage of HIV cases caused by each pathway are as follows:
- Latin America and the Caribbean: 0.5%
- Eastern Europe and Central Asia: 0.9%
- West and Central Africa: 2.2%
- East and Southern Africa: 7.1%
These percentages represent the prevalence of HIV cases in the respective regions.