Expecting the Unexpected: How Tuberculosis Hides in Plain Sight During Pregnancy and the First Year of Life
For most obstetricians practicing in the United States today, tuberculosis is not on the differential. It does not appear in standard prenatal intake forms at most hospital systems. It is rarely addressed in OB/GYN residency training. And yet, for a growing number of pregnant women — particularly those from communities already underserved by the broader healthcare system — TB is a present and dangerous reality, one that threatens not only the mother but the infant she is carrying.
The consequences of this collective blind spot are measurable. Delayed diagnoses, inadequate treatment initiation, and missed opportunities for newborn prophylaxis are all downstream effects of a system that has never fully integrated tuberculosis into the framework of maternal medicine. Understanding why this gap exists — and what closing it would require — demands an honest examination of both clinical training and structural priorities in American obstetric care.
A Confluence of Vulnerability
Pregnancy fundamentally alters immune function. The immunological shifts that allow a mother's body to tolerate a developing fetus also create conditions under which latent tuberculosis infection is more likely to progress to active disease. Estimates from international literature suggest that pregnant women with untreated latent TB infection face a meaningfully elevated risk of progression compared to non-pregnant adults, though precise domestic data remains limited — itself a reflection of how rarely TB is systematically tracked within obstetric populations in the U.S.
Active TB disease during pregnancy is associated with a range of serious complications, including preterm labor, low birth weight, intrauterine growth restriction, and increased maternal mortality. These outcomes are not inevitable, but they are far more likely when diagnosis is delayed — and delay is the norm when providers are not looking.
Adding urgency to the picture is the phenomenon of congenital and perinatal tuberculosis. While relatively rare, vertical transmission — the passage of Mycobacterium tuberculosis from mother to infant either in utero, during delivery, or through respiratory exposure in the early postnatal period — represents one of the most severe and least anticipated presentations of TB in American clinical practice. Newborns with TB infection are notoriously difficult to diagnose; their symptoms overlap with a wide range of neonatal conditions, and standard screening tools developed for adults perform poorly in infants.
What OB/GYN Training Leaves Out
A physician completing an obstetrics and gynecology residency in the United States will spend years developing expertise in gestational hypertension, fetal monitoring, operative delivery, and the management of postpartum hemorrhage. They will learn to screen for gestational diabetes, Group B streptococcus, and a battery of sexually transmitted infections. What they will almost certainly not receive is structured education on recognizing tuberculosis in a pregnant patient.
This omission is not a matter of individual oversight. It reflects how TB has been categorized institutionally — as an infectious disease subspecialty concern, not a frontline obstetric one. The result is that providers who see pregnant patients every day are not equipped to recognize the clinical signs of pulmonary TB, do not know when to order a tuberculin skin test or an interferon-gamma release assay, and may not be aware that certain first-line TB medications are considered safe during pregnancy while others carry teratogenic risk.
The knowledge gap extends to risk stratification. Obstetricians may not routinely ask about immigration history, country of origin, housing conditions, or occupational exposure — all factors that significantly inform TB risk in a prenatal patient. Without a structured framework for asking these questions, high-risk patients move through prenatal care unscreened.
Who Is Most at Risk — and Why They Are Least Likely to Be Screened
The populations bearing the greatest burden of TB in the United States are also among those with the most complex relationships with the healthcare system. Foreign-born individuals, many of whom originate from countries with high TB prevalence, account for a disproportionate share of TB cases diagnosed domestically each year. Among pregnant women specifically, immigrant and refugee populations face compounding barriers: language differences, limited insurance coverage, distrust of government-affiliated health systems, and logistical obstacles to consistent prenatal care.
Homeless pregnant women, those experiencing substance use disorders, and individuals living in congregate settings represent additional high-risk subgroups who are often encountered irregularly in obstetric settings, if at all. For these patients, a prenatal visit may represent one of the few consistent points of healthcare contact — making it an irreplaceable opportunity for TB screening that is currently being squandered.
The Newborn in the Room
When a mother with undiagnosed active TB delivers, the newborn enters an environment of immediate exposure. Infants lack the immune maturity to contain TB infection effectively, and disease in neonates can progress with alarming speed to disseminated or meningeal forms. The clinical presentation — fever, poor feeding, respiratory distress — is nonspecific, and even experienced neonatologists may not initially consider TB in the differential.
Established protocols for managing infants born to mothers with suspected or confirmed TB do exist, including separation guidance, BCG vaccination considerations, and isoniazid prophylaxis. However, these protocols are only actionable when the maternal diagnosis is known. When TB is not identified until after delivery — or not at all — the window for protective intervention closes.
Pediatric infectious disease specialists have long advocated for better communication between obstetric and neonatal teams regarding TB risk. In practice, that coordination is inconsistent and depends heavily on individual institutional culture rather than standardized protocol.
Integrating TB Into the Prenatal Standard of Care
Addressing this gap requires action at multiple levels. At the clinical level, prenatal intake questionnaires should include targeted TB risk-factor screening, and providers should be trained to interpret and act on those responses. Professional societies representing obstetricians and maternal-fetal medicine specialists have an opportunity — and an obligation — to develop and disseminate updated guidance that reflects the current epidemiological landscape.
At the systems level, state and local health departments can support TB integration in obstetric settings by providing training resources, ensuring rapid access to confirmatory testing, and establishing clear referral pathways for pregnant patients who screen positive. Funding for these initiatives should be prioritized in TB prevention budgets, not treated as a peripheral concern.
For community health organizations working with high-risk pregnant populations, TB education and screening can be woven into existing outreach models — mirroring successful approaches already deployed in HIV prevention and gestational diabetes awareness.
A Diagnosis That Cannot Wait Nine Months
Tuberculosis does not pause for pregnancy. It does not defer to the complexity of prenatal care or wait for a more convenient clinical moment. For the women and infants currently falling through the gaps of an undertrained and underalerted obstetric system, the cost of inaction is measured in delayed diagnoses, preventable complications, and — in the worst cases — lives lost.
The StopTB Initiative urges healthcare institutions, training programs, and public health authorities to treat maternal TB screening not as an afterthought, but as a foundational element of comprehensive prenatal care. The tools exist. The knowledge exists. What is required now is the institutional will to use both.
