Tabitha Schulke, Oregon Teen, Baffles Doctors With Severe Mystery Illness (VIDEO)

On Thanksgiving day, an Oregon teen began experiencing flu-like symptoms and fell mysteriously ill. Now, 18-year-old Tabitha Schulke from Monmouth has had both her legs amputated due to the unexplained infection, ABC News affiliate KATU reports.

According to USA Today, the infection has attacked her major organs and brain.

Schulke -- who is on life support at a local hospital, immobilized and relying on a ventilator to breathe -- has stumped health care professionals with her condition. Doctors say the young woman may have developed gangrene resulting from toxic shock caused by a staph infection. Patients with toxic shock have a 50 percent survival rate, according to USA Today.

However, the cause of the potential staph infection is still to be determined, KATU reports. The teen's family, who is currently waiting on lab results for more information, is devastated by the sudden illness, but they remain hopeful about her recovery.

Watch the video above, and head over to KATU News to read the original story.

Dr. Eric Chang with Legacy Emanuel Hospital in Portland told KATU: "When she came here, she was very close to death and she's come very far, so that makes us very hopeful for the future."

Schulke is a Sunday school teacher who had plans to become a missionary in her future. Just prior to going into shock on Thanksgiving, she had been out in the cold delivering food boxes to families in need. Now, Schulke's church, Independence First Baptist Church, is sending donations to Tabitha and her family in Portland.

Earlier this year, what seemed to be another "mystery illness" swept a group of teen girls at a high school in upstate New York. At LeRoy High School, 12 girls developed Tourettes-like symptoms that some neurologists speculated to be PANDAS, while others claimed that it was "conversion disorder."