By her own estimate, Karla Jacinto told CNN that 43,200 is the number of times she was raped after falling into the hands of human traffickers.

She says up to 30 johns a day, seven days a week, for the best part of four years -- 43,200.

Her story highlights the brutal realities of human trafficking in Mexico and the United States, an underworld that has destroyed the lives of tens of thousands of Mexican girls like Karla.

Human trafficking has become a trade so lucrative and prevalent, that it knows no borders and links towns in central Mexico with cities like Atlanta and New York.

U.S. and Mexican officials both point to a town in central Mexico that for years has been a major source of human trafficking rings and a place where victims are taken before being eventually forced into prostitution. The town is called Tenancingo.

Even though it has a population of about 13,000, Susan Coppedge, the U.S. State Department's Ambassador at Large to Combat Human trafficking, says it has an oversized reputation when it comes to prostitution and pimping.

"That's what the town does. That is their industry," Coppedge says. "And yet in smaller, rural communities the young girls don't have any idea that this is what the town's reputation is, so they are not suspicious of the men who come from there. They think they have got a great future with this person. They think they love and it is the same story of recruitment every time."

Karla says she was abused for as long as she can remember and felt rejected by her mother. "I came from a dysfunctional family. I was sexually abused and mistreated from the age of 5 by a relative,' she told CNN correspondent, Rafael Romo.