FOR IMMEDIATE RELEASE
New Peer-Reviewed Publication Highlights Evidence of Mother-to-Child-Transmission of Lyme Disease Bacteria During Pregnancy and Calls for Urgent Research
New paper in Frontiers in Medicine reports results of meeting of international researchers at the Banbury Center of Cold Spring Harbor Laboratory
PORTOLA VALLEY, Calif., April 9, 2026 –Bay Area Lyme Foundation, a national nonprofit and leading sponsor of tick-borne disease research in the US, today announced publication of a new peer-reviewed article in Frontiers in Medicine examining the transmission of the Lyme bacteria during pregnancy. The publication points to observational research demonstrating that Lyme bacteria are capable of being transmitted from mother to unborn child and recognition by both the Centers for Disease Control and Prevention (CDC) and the National Institutes of Health (NIH) of the potential for mother-to-child transmission. With approximately 500,000 Americans diagnosed with Lyme disease each year and the related correlation of transmission during pregnancy being associated with serious adverse pregnancy outcomes, such as miscarriage, stillbirth, or congenital infection that occur in some cases, the paper concludes that the clinical impact of Lyme disease on pregnancy and infant health is an important public health issue that has been insufficiently studied.
“As an infectious disease pediatrician, I have seen firsthand the impact of Lyme disease in children and have suspected that the infection may have been passed from mother to child during pregnancy in a number of my patients, based on their medical histories,” said Charlotte Mao, MD, of Bay Area Lyme Foundation and a co-author of the study. “The first case studies of mother-to-child transmission were observed in the 1980s, yet decades later, we still lack sufficient research and clear, evidence-based guidance on Lyme in pregnancy and adverse pregnancy outcomes. This is an important public health issue and underscores the urgent need for rigorous studies to fully understand the risks and support patients and healthcare providers in making informed decisions that better protect maternal and infant health.”
Study authors highlight the great need for real-world studies clarifying how Lyme Borrelia, the bacteria that cause Lyme disease, the most common vector-borne disease in the US, behaves during pregnancy, and quantifying the outcomes for mothers and infants. Specifically, the paper suggests the creation of large, prospective studies of pregnant individuals with Lyme disease, including systematic long-term clinical follow-up of their children, as well as the importance of collecting biological samples from mothers, placentas, and infants through coordinated biorespositories for use in current or future studies.




For too many people with Lyme disease, the journey begins with uncertainty. A missed rash. A negative test. Symptoms that don’t make sense. A diagnosis that comes too late, or not at all. Bay Area Lyme Foundation believes this must change. And we believe change happens through funding rigorous science, innovative thinking, and supporting researchers willing to tackle the hardest questions head-on.






