Refer to the graph showing a typical progression of an untreated HIV infection in a human.The x axis represents time, but the scale differs in different subsections. 
At what point in the progress of the HIV infection do opportunistic infections typically appear?
Definitions:
Crowdsourcing
The process of obtaining needed services, ideas, or content by soliciting contributions from a large group of people, especially from the online community.
Massive Numbers
Extremely large quantities or figures, often used to emphasize the scale or significance of a particular statistic or phenomenon.
Marketing Actions
Steps or activities undertaken by a company as part of its marketing strategy to promote its products or services.
Crowdfunding
The practice of funding a project or venture by raising small amounts of money from a large number of people, typically via the internet.
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