WARNING: GRAPHIC CONTENT

New book, Tomorrow Is A Long Day, depicts how HIV is gripping the city

Is partly caused by men having sex with men or transgender prostitutes

The problem is also worsened by the injection or selling of drugs

Follows the journeys of 24 people have suffer from the deadly virus

Studies suggest as many as one in every 125 people in Tijuana have AIDS

It has been a beloved tourist spot for more than a century and is one of the fastest growing cities in Northern America.

But as Tijuana thrives, so does a problem caused by many of the vices drawing thousands of visitors south of the border with Mexico every year.

An AIDS epidemic is developing because of rampant prostitution, unprotected sex and drug addiction.

Reyna Ortiz holds a syringe in her mouth before injecting heroin on the border between the US and Mexico. She is one of the highest risk groups for HIV: a female who injected drugs and had regular unprotected sex with a male addict who was also injecting