Longer article from 2006 here at Wired with this opening paragraph
"Claudia Menashe needed pictures of sick people. A project director at the National Health Museum in Washington, DC, Menashe was putting together a series of interactive kiosks devoted to potential pandemics like the avian flu. An exhibition designer had created a plan for the kiosk itself, but now Menashe was looking for images to accompany the text. Rather than hire a photographer to take shots of people suffering from the flu, Menashe decided to use preexisting images – stock photography, as it’s known in the publishing industry.A more recent article on Crowdsourcing including an excerpt from the book here, again from Wired.
In October 2004, she ran across a stock photo collection by Mark Harmel, a freelance photographer living in Manhattan Beach, California. Harmel, whose wife is a doctor, specializes in images related to the health care industry. “Claudia wanted people sneezing, getting immunized, that sort of thing,” recalls Harmel, a slight, soft-spoken 52-year-old."