Katheryn Deprill
Katheryn Deprill has launched a Facebook campaign to find her biological mother Facebook

A woman who was abandoned by her mother on the floor of a Burger King restaurant in 1986 has now decided to break the silence and seek out her biological parent.

Katheryn Deprill has posted a photo on Facebook of herself holding a sign, asking for help.

The sign reads: "Looking for my birth mother. She gave birth to me September 15th 1986. She abandoned me in the Burger King bathroom only hours old, Allentown PA [Pennsylvania]. Please help me find her by sharing my post. Maybe she will see this. Thank you."

Katheryn Deprill

Nearly 28,000 people have shared Deprill's story, but her biological mother has not yet contacted her.

Deprill, now 27, was just few hours old when her mother left her on the bathroom floor of the fast-food branch.

When staff found her, they called the police who tried, unsuccesfully, to locate her mother.

Deprill was raised by an adoptive family and never knew who her biological mother was; she learned about her abandonment as a 12-year-old, when her sixth-grade teacher assigned the class a project focusing on the students' family backgrounds.

"Unless you're adopted, you're not going to understand that piece of you that feels like it's missing if you don't know who your parents are," Deprill told FoxNews.com.

Deprill said she initially thought there was something wrong with her, and this drove her mother to abandon her new-born child.

The more she grew up, however, the more she began to sympathise with her biological mother and become grateful that she never used drugs or alcohol during her pregnancy, allowing her to grow up healthy.

"I can't imagine what she had to go through," Deprill said. "She could have been in a very abusive relationship. There are so many things that could have been, and you don't know until you walk a mile in her shoes."

Deprill insists that no legal action can be taken against her biological mother, and adds that her cause has spurred other people to look for their birth parents as well. And she says her story serves as a reminder for parents who are unable to raise their children.

"There's always an option to just not leave your baby. Adoption is just a wonderful thing," Deprill concluded.