2-Year-Old's Rash Saved His Baby Sister's Life

Callum Nelson's parvovirus rash led to a life-saving diagnosis for his unborn sister

Published on Mar. 5, 2026

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When 2-year-old Callum Nelson broke out in a bright red rash, his mother Louise rushed him to urgent care. The pediatrician confirmed Callum had parvovirus, also known as fifth disease, which can be dangerous for pregnant women. Louise's blood test showed she had a recent parvovirus infection, leading to an emergency trip to Texas Children's Hospital where doctors performed multiple blood transfusions to save her unborn daughter Ayvah Louise, who was showing signs of anemia due to the virus. Ayvah Louise was born at 37 weeks and is now a healthy 7-month-old baby.

Why it matters

Parvovirus, while usually mild in children, can pose serious risks to unborn babies if contracted by pregnant women. This case highlights the importance of vigilance and testing for parvovirus exposure during pregnancy, as it is not universally screened for in the U.S.

The details

When Callum Nelson, 2, broke out in a bright red rash, his mother Louise rushed him to urgent care. The pediatrician confirmed Callum had parvovirus, also known as fifth disease. Louise, who was 18 weeks pregnant at the time, called her midwife and got a blood test that showed she had a recent parvovirus infection. She was referred to a maternal fetal medicine specialist, who found her unborn daughter was anemic and in distress due to the virus. Over the next few weeks, Louise traveled to Texas Children's Hospital where her daughter received three blood transfusions through the umbilical cord to save her life. Ayvah Louise was born at 37 weeks and is now a healthy 7-month-old baby.

  • In January 2025, Callum Nelson, 2, broke out in a rash.
  • In February 2025, when Louise Nelson was 18 weeks pregnant, tests showed she had a recent parvovirus infection.
  • On February 26, 2025, an ultrasound showed Louise's unborn daughter was anemic and in distress.
  • In March 2025, Louise's daughter received three blood transfusions at Texas Children's Hospital.
  • On July 8, 2025, Louise's daughter Ayvah Louise was induced at 37 weeks and born healthy.

The players

Callum Nelson

Louise Nelson's 2-year-old son who broke out in a parvovirus rash, leading to the diagnosis that saved his unborn sister's life.

Louise Nelson

A 37-year-old pregnant woman from Livingston, Alabama whose son's parvovirus rash led to the discovery that her unborn daughter was at risk.

Ross Nelson

Louise's husband, the head men's soccer coach at the University of West Alabama.

Ayvah Louise Nelson

Louise and Ross Nelson's daughter who was born healthy after receiving multiple blood transfusions in utero to treat anemia caused by parvovirus.

Dr. Jessian Munoz

A maternal fetal medicine and fetal surgery specialist at Texas Children's Hospital who treated Ayvah Louise.

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What they’re saying

“If Callum hadn't broken out in a rash, I probably would've had a miscarriage and never known the reason why.”

— Louise Nelson (People)

“She's definitely our little miracle baby.”

— Ross Nelson (People)

“This disease is such a subtle virus in toddlers, and even if an adult gets it, at the worst case, it's like a common cold. I think it's just something that could be easily overlooked by other parents that are expecting a child. Hopefully raising that awareness could save another baby.”

— Ross Nelson (People)

“In recent years, parvovirus has become more aggressive. We're noticing more mothers being exposed and fetuses becoming sicker much faster.”

— Dr. Jessian Munoz, maternal fetal medicine and fetal surgery specialist at Texas Children's Hospital (People)

What’s next

The Nelsons hope to raise awareness about the dangers of parvovirus during pregnancy to prevent other families from going through a similar experience.

The takeaway

This case highlights the importance of vigilance and testing for parvovirus exposure during pregnancy, as the virus can pose serious risks to unborn babies even though it usually causes only mild symptoms in children.