Stillbirth is a deeply painful experience that affects thousands of families every year around the world. It refers to the loss of a baby before or during delivery, typically after 20 weeks of pregnancy. While there are many possible causes, infections that cause stillbirth are among the most significant and preventable factors. Certain bacterial, viral, and parasitic infections can cross the placenta and affect the developing baby, leading to complications that may result in stillbirth. Understanding which infections pose risks, how they spread, and ways to prevent them is essential for expectant mothers and healthcare providers alike.
How Infections Cause Stillbirth
During pregnancy, the mother’s immune system undergoes changes to support the growth of the fetus. While these changes are natural, they can also make pregnant women more vulnerable to certain infections. Some infections may cause inflammation of the placenta, interfere with the baby’s oxygen and nutrient supply, or directly infect fetal tissues. In many cases, infections that cause stillbirth can occur silently without obvious symptoms in the mother, making screening and early medical care especially important.
Pathogens can reach the baby through the placenta, the birth canal, or even through the bloodstream. Once an infection reaches the fetus, it can cause serious damage to organs, trigger premature labor, or lead to fetal death. Early detection and prevention remain the most effective strategies to reduce the risk of infection-related stillbirths.
Common Infections That Cause Stillbirth
Several infectious agents are known to be linked to stillbirths. These include bacteria, viruses, and parasites that can be transmitted during pregnancy. Below are some of the most well-documented infections associated with this condition.
Listeria Monocytogenes
Listeria infection, or listeriosis, is one of the most common infections that cause stillbirth. This bacterium is often found in contaminated food such as unpasteurized dairy products, soft cheeses, deli meats, and raw vegetables. Pregnant women are about ten times more likely to get listeriosis than the general population. The infection can cross the placenta, leading to fetal infection, miscarriage, or stillbirth. Symptoms in the mother may include fever, muscle aches, and flu-like illness, though in many cases, the infection may go unnoticed until complications occur.
Toxoplasmosis
Toxoplasmosis is caused by the parasiteToxoplasma gondii, which is commonly found in undercooked meat, contaminated water, and cat feces. When a pregnant woman becomes infected, the parasite can cross the placenta and harm the fetus. In severe cases, toxoplasmosis can cause brain damage, eye problems, or stillbirth. The risk of transmission increases with gestational age, but the severity of fetal damage tends to be greater when the infection occurs early in pregnancy. Avoiding raw meat and practicing good hygiene when handling pets are key preventive measures.
Syphilis
Syphilis is a sexually transmitted infection caused by the bacteriumTreponema pallidum. It remains a major cause of stillbirth worldwide, especially in areas with limited access to prenatal care. If untreated, syphilis can pass from mother to baby through the placenta at any stage of pregnancy. The infection can result in miscarriage, premature birth, or stillbirth. Regular prenatal screening and timely antibiotic treatment can prevent nearly all cases of syphilis-related stillbirth.
Group B Streptococcus (GBS)
Group B Streptococcus is a common bacterium that naturally lives in the lower genital tract of many women. While it usually causes no harm to healthy adults, it can be dangerous during pregnancy. GBS can infect the baby before or during delivery, leading to serious complications such as pneumonia, sepsis, or stillbirth. Pregnant women are typically screened for GBS late in pregnancy, and if positive, they are given antibiotics during labor to protect the baby.
Parvovirus B19
Parvovirus B19, also known as fifth disease, is a viral infection that primarily affects children but can also harm pregnant women. If infection occurs during pregnancy, the virus can cause severe fetal anemia and heart failure, resulting in stillbirth in some cases. Many adults are already immune due to childhood exposure, but for those who are not, avoiding contact with infected individuals can reduce risk.
Cytomegalovirus (CMV)
Cytomegalovirus is a common virus that belongs to the herpes family. It often causes mild symptoms in healthy adults but can lead to serious problems in unborn babies if transmitted during pregnancy. Congenital CMV infection can cause brain damage, hearing loss, and, in severe cases, stillbirth. The virus is spread through bodily fluids, such as saliva and urine, so proper hygiene and avoiding sharing utensils with young children can help reduce risk.
Herpes Simplex Virus (HSV)
Herpes simplex virus, particularly HSV-2, can be transmitted to the baby during pregnancy or delivery. While most infections occur during birth, intrauterine infection can sometimes result in stillbirth. Pregnant women with known herpes infections are closely monitored, and antiviral medications may be prescribed to lower the risk of transmission during delivery.
Rubella (German Measles)
Rubella was once a leading cause of stillbirth and congenital abnormalities, but widespread vaccination has significantly reduced its incidence. When a pregnant woman contracts rubella during the first trimester, the virus can cause congenital rubella syndrome, which may lead to stillbirth or severe birth defects. Vaccination before pregnancy remains the most effective prevention method.
Symptoms and Warning Signs
Many infections that cause stillbirth present with few or mild symptoms in the mother, making them difficult to detect without medical testing. However, some general warning signs may include
- Fever or chills during pregnancy
- Unusual vaginal discharge or bleeding
- Decreased fetal movement
- Flu-like symptoms such as fatigue, muscle aches, or headache
- Pain or tenderness in the abdomen
Any of these symptoms should be reported immediately to a healthcare provider for further evaluation. Early diagnosis and treatment can prevent the infection from spreading to the fetus and reduce the risk of stillbirth.
Prevention Strategies
Preventing infections that cause stillbirth involves a combination of lifestyle habits, medical screening, and vaccination. Pregnant women can take several practical steps to lower their risk.
Safe Food Handling
To prevent foodborne infections such as listeriosis and toxoplasmosis, avoid unpasteurized dairy products, wash fruits and vegetables thoroughly, and cook meat completely. Avoid eating cold deli meats unless reheated to steaming hot temperatures.
Hygiene and Pet Care
Practicing good hygiene such as washing hands frequently and avoiding contact with cat litter can help reduce exposure to infectious agents. If you must handle cat litter, use gloves and wash your hands thoroughly afterward.
Vaccinations
Vaccinations are among the most effective tools for preventing infections that can cause stillbirth. Vaccines for rubella, hepatitis B, and influenza can protect both the mother and the baby. Women are encouraged to ensure all recommended vaccinations are up to date before conception.
Prenatal Screening
Routine prenatal care includes screening for syphilis, GBS, and other infections that could threaten fetal health. Early detection allows doctors to administer treatments, such as antibiotics or antivirals, that can prevent transmission to the baby.
The Role of Prenatal Care
Regular prenatal visits are crucial in identifying risk factors and managing infections early. Healthcare providers can perform blood tests, urine tests, and ultrasounds to monitor both the mother’s and baby’s health. Expectant mothers should communicate openly about any symptoms, exposures, or concerns they may have during pregnancy.
In some cases, additional monitoring, such as fetal heart rate assessments or growth scans, may be recommended if an infection is suspected. Effective medical management can significantly reduce complications and improve outcomes for both mother and child.
Infections that cause stillbirth remain a serious but largely preventable problem. Understanding the risks, recognizing symptoms, and taking proactive measures can help protect the health of both mother and baby. With proper hygiene, vaccination, safe food practices, and consistent prenatal care, the likelihood of infection-related stillbirths can be greatly reduced. Raising awareness about these infections empowers families to make informed choices and supports healthier pregnancies worldwide.