Final answer:
The number of new HIV infections worldwide in 2011 is about 2.7 million. Most of the people living with HIV are in Sub-Saharan Africa.
Step-by-step explanation:
The number of new HIV infections worldwide in 2011 is about 2.7 million. According to the provided information, the number of newly infected people declined from 3 million in 2001 to 2.7 million in 2005. While antiretroviral treatments have led to a reduction in deaths, the number of people living with HIV continues to rise. In 2007, it was estimated to be around 33 million. Most of the people living with HIV are in Sub-Saharan Africa.