WARNING: GRAPHIC IMAGES BELOW

While the majority of cases diagnosed as flesh-eating bacteria involve a body of water, one California woman who lost the majority of muscle and skin on her left foot said the origin of her infection remains a mystery.

“I retraced my steps and it’s still a mystery to the origin,” Noelle Guastucci, of University Heights, told Fox 5 San Diego.

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Guastucci, who was released from the hospital on Wednesday after nearly two weeks of care, said doctors told her that if she waited until the next morning to seek help she possibly could’ve lost her life.

Guastucci said it started with what felt like an internal bruise on the Fourth of July, which quickly progressed on the pain scale and was accompanied by intense swelling. Within two minutes her foot had ballooned to a size she knew required medical attention.

“The pain was so excruciating,” she told Fox 5 San Diego. “On a scale from one to 10, it was an 11. It felt like someone had poured acid on my foot.”

She was rushed to Kaiser Permanente where doctors worked to control her infection and stop it from spreading. At its worst, Guastucci’s foot bones were nearly exposed.

“I was facing possibly amputation,” she told the news outlet. “I was told if I waited very many hours, until the next morning from the middle of the night that I would’ve possibly lost my leg.”

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The necrotizing fasciitis cases, or flesh-eating bacteria infections currently dominating the headlines are often the result of swimmers entering the water with open cuts or wounds, and are being linked to Vibrio vulnificus, but there are other ways to contract the rare infection.

According to the Centers for Disease Control and Prevention (CDC), experts believe group A Streptococcus are the most common cause of necrotizing fasciitis, although the method of entry is still the same as cases involving water. The bacteria most commonly enters the body through a break in the skin including cuts and scrapes, burns, insect bites, puncture wounds, surgical wounds, or blunt trauma.

The infection spreads very quickly with early symptoms including red or swollen skin, severe pain and fever that later progresses to ulcers, blisters or black spots on skin, changes in skin color, pus, dizziness, fatigue or diarrhea or nausea.

Prompt treatment is vital in patients diagnosed with necrotizing fasciitis. Antibiotics and surgery are typically the first approach, as well as intravenous antibiotics. It is not unusual for patients with this type of infection to require several surgeries and possibly even a blood transfusion. In severe cases it can lead to sepsis, shock and organ failure. It can also leave patients with long-term complications from loss of limbs or scarring. Even with prompt treatment, up to 1 in 3 people diagnosed with the infection die.

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It is not clear if Guastucci’s case was linked to group A strep, but she said she is thankful to have sought help when she did and for the support she has received from family members. She said she wants others to know about the seriousness of the infection.