A staph infection threatens the lives of cops, firefighters and homeless people. But don't expect any help from county health officials Detective Tricia Hauck finished a burglary investigation at Pete's Café and returned to the Central Division station near Skid Row. Her left foot started to feel uncomfortably warm. She wondered if it had anything to do with an ankle fracture she suffered on vacation in Mexico a few months earlier. Within a half hour, the warm feeling turned into pain so excruciating that her leg went numb. Unable to walk, the 39-year-old burglary-investigations supervisor was carried to a patrol car and rushed by her partner to an emergency room.

An MRI detected fluid around her bone. Later that day, a surgeon cut into her foot and removed an abscess. The diagnosis: Skid Row staph, or, more technically, a strain of methicillin-resistant Staphylococcus aureus that is sickening dozens of police officers, firefighters, health-care workers and homeless people. These cases pose a new challenge to county health officials, who so far have refused appeals by Skid Row care providers to step up help to the city's most down-and-out population. Cops are so accustomed to seeing people with oozing boils that they call them Skid Row cooties.

Doctors inserted tiny tubes in Hauck's foot to drain the curdled white pus. But the infection proved resistant to six antibiotics.

Finally, on September 27, doctors prescribed the antibiotic of last resort - vancomycin, which she takes intravenously at home, where she spends most of the day in bed.

Twice a week, Hauck's nurses come to her home to change her IV lines. Doctors fear the infection is eating at her bones, and that her ankle may become so overtaken with bacteria that they will be forced to fuse together the bones in her ankle, rendering her unable to walk without help. Right now, the least of her worries are the medical bills; drugs and supplies alone total around $2,000.

Hauck believes that she caught the highly contagious bug at her station on Skid Row, which has become a giant petri dish for Skid Row staph. Nearly 1,500 homeless people living and sleeping on the streets, with little or no access to proper hygiene, soap or warm water, make it an ideal breeding ground for the bacteria.

"We work in a filthy environment with people who don't practice good hygiene and are in and out of jail," Hauck says. "Officers use each other's computers all night long. I have my hands on the tables in the interview rooms. Our floors are filthy. It is a huge thoroughfare. These wounds were exposed to my environment, which is as dirty as it could be."

In 2005, staph infections hit at least 20 Los Angeles city firefighters, many of whom work on Skid Row. A staph infection landed a deputy city attorney, who works out of the Central Division police station, in the hospital for two weeks. An LAPD helicopter pilot, who helped a homeless man across the street, almost had to have his leg amputated. Two doctors working at a wound-care clinic got infected. A chaplain and a night manager working at the Union Rescue Mission got it. So did the director of public affairs and two other employees at Midnight Mission. Besides Hauck, a deputy chief and a rookie officer at LAPD's Central Division have been diagnosed with Skid Row staph.