SEXUALLY TRANSMITTED INFECTIONS DURING PREGNANCY: THE SILENT INFECTIONS THAT CAN THREATEN MOTHER, BABY, AND SAFE DELIVERY

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Introduction

Sexually transmitted infections, commonly called STIs, are infections passed mainly through intimate contact. During pregnancy, they become especially important because they can affect not only the mother but also the unborn baby, the newborn, the placenta, the membranes, and the outcome of delivery.

Some STIs cause obvious symptoms. Others remain silent for months or years. This silence is dangerous because untreated infections can lead to miscarriage, preterm birth, low birth weight, newborn eye infection, pneumonia, congenital syphilis, HIV transmission, hepatitis B infection, and long-term disability.

The good news is powerful: many STIs in pregnancy can be detected, treated, controlled, or prevented through antenatal screening, safe medicines, partner treatment, delivery planning, and newborn protection. CDC STI treatment guidance remains a major evidence-based reference for screening, diagnosis, and treatment decisions.

UNDERSTANDING STIs IN PREGNANCY

STIs may be caused by bacteria, viruses, or parasites.

Common STIs relevant to pregnancy include:

  • Syphilis
  • HIV
  • Hepatitis B
  • Gonorrhea
  • Chlamydia
  • Trichomoniasis
  • Genital herpes
  • Human papillomavirus
  • Hepatitis C

Pregnancy does not always make STIs more likely, but pregnancy makes their consequences more serious because infections can affect the baby before birth, during delivery, or after birth.

WHY STIs ARE DANGEROUS DURING PREGNANCY

STIs may cause harm through inflammation, placental infection, membrane weakness, fetal exposure, or newborn infection.

They may lead to:

  • Miscarriage
  • Stillbirth
  • Preterm labour
  • Premature rupture of membranes
  • Low birth weight
  • Fetal growth restriction
  • Newborn blindness
  • Newborn pneumonia
  • Newborn sepsis
  • Congenital infection
  • Long-term disability

WHO warns that untreated maternal syphilis is especially dangerous and can cause severe adverse pregnancy outcomes.

COMMON STIs THAT AFFECT PREGNANCY

Syphilis

Syphilis can cross the placenta and infect the fetus. Untreated infection can cause miscarriage, stillbirth, preterm birth, congenital syphilis, and newborn death. Penicillin treatment during pregnancy is highly effective when given early.

HIV

HIV can pass from mother to baby during pregnancy, labour, delivery, or breastfeeding. With antiretroviral therapy, viral-load monitoring, safe delivery planning, and newborn medicines, transmission risk can be greatly reduced.

Hepatitis B

Hepatitis B can pass to the baby around delivery. Newborn protection requires timely hepatitis B vaccine and, when indicated, hepatitis B immune globulin.

Gonorrhea

Gonorrhea may cause pelvic infection, premature rupture of membranes, preterm birth, and newborn eye infection.

Chlamydia

Chlamydia can be silent. It may cause cervicitis, pregnancy complications, newborn conjunctivitis, and newborn pneumonia.

Trichomoniasis

Trichomoniasis may cause vaginal discharge, irritation, and may be associated with preterm birth and low birth weight.

Genital Herpes

Herpes can be dangerous for newborns, especially if the mother acquires infection late in pregnancy or has active lesions at delivery.

Human Papillomavirus

HPV may cause genital warts and cervical cell changes. Most HPV infections do not directly harm the baby, but large warts may complicate delivery.

SIGNS AND SYMPTOMS OF STIs IN PREGNANCY

Many STIs have no symptoms.

Possible symptoms include:

Unusual Vaginal Discharge

Discharge may become yellow, greenish, foul-smelling, thick, or irritating.

Painful Urination

Burning urination may suggest infection.

Lower Abdominal Pain

Pelvic pain should be assessed.

Genital Sores or Blisters

These require urgent medical review.

Genital Itching or Irritation

This may occur with several infections.

Bleeding After Intimacy

This may suggest cervical inflammation.

Rash, Fever, or Swollen Glands

These may occur with syphilis, HIV, herpes, or other infections.

DANGER SIGNS THAT REQUIRE URGENT CARE

Seek urgent medical care if there is:

  • Fever
  • Severe lower abdominal pain
  • Reduced fetal movement
  • Vaginal bleeding
  • Fluid leakage
  • Painful genital sores
  • Severe weakness
  • Contractions before term
  • New rash after exposure
  • Partner diagnosed with an STI

DIAGNOSIS AND SCREENING DURING ANTENATAL CARE

Testing is the foundation of prevention.

Prenatal screening for HIV, syphilis, hepatitis B, and hepatitis C is recommended for all pregnant women in many guidelines, while chlamydia, gonorrhea, and TB screening may be recommended based on age, risk, symptoms, or local burden.

Blood Tests

Used for HIV, syphilis, hepatitis B, hepatitis C, and sometimes herpes evaluation.

Urine or Swab Tests

Used for chlamydia, gonorrhea, and trichomoniasis.

Cervical Screening

Important for HPV-related cervical changes when indicated.

Repeat Testing

Repeat testing may be needed later in pregnancy. ACOG now recommends syphilis screening at the first prenatal visit, in the third trimester, and at birth.

TREATMENT OF STIs DURING PREGNANCY

Treatment depends on the infection, pregnancy stage, allergies, local resistance patterns, and fetal safety.

Antibiotics for Bacterial STIs

Syphilis, gonorrhea, chlamydia, and some other bacterial infections can be treated with pregnancy-compatible antibiotics. The exact medicine must be selected by a qualified clinician.

Antiviral Medicines

HIV requires antiretroviral therapy. Herpes may require antiviral treatment, especially near delivery or during outbreaks.

Hepatitis B Management

Some mothers with high hepatitis B viral load may need antiviral treatment, and the baby needs vaccine-based protection after birth.

Partner Treatment

Partner testing and treatment are essential. If only the pregnant woman is treated and the partner remains untreated, reinfection can occur.

Follow-Up Testing

Some infections require test-of-cure or repeat testing after treatment.

HOME CARE AND SUPPORTIVE MEASURES

Home care cannot cure STIs.

Safe supportive measures include:

Attend Antenatal Care Early

Testing early protects the mother and baby.

Complete Prescribed Treatment

Do not stop medicines because symptoms disappear.

Avoid Reinfection

Follow medical advice about avoiding exposure until treatment is complete.

Encourage Partner Testing

This protects the family and prevents repeated infection.

Maintain Good Hygiene

Hygiene supports comfort but does not cure STIs.

Avoid Unsafe Herbal Mixtures

Herbal washes, steaming, “infection flushes,” and unverified remedies can delay treatment and may harm pregnancy.

PREVENTION OF STIs DURING PREGNANCY

Prevention is built on awareness, testing, treatment, and respectful communication.

Know Your Status

Early antenatal testing is lifesaving.

Treat Infections Promptly

Delays increase fetal risk.

Partner Testing

Both partners may need screening.

Vaccination

Hepatitis B vaccination and HPV vaccination before pregnancy can prevent future disease.

Avoid Stigma

Stigma drives infections underground. Compassion brings women to care.

HOW STIs AFFECT THE NEWBORN

Newborn effects depend on the infection.

Possible newborn complications include:

  • Eye infection
  • Pneumonia
  • Sepsis
  • Congenital syphilis
  • HIV infection
  • Hepatitis B infection
  • Brain infection
  • Skin lesions
  • Prematurity-related illness
  • Long-term developmental challenges

Newborns exposed to certain infections may require eye care, blood tests, antibiotics, antivirals, immunization, immune globulin, or specialist follow-up.

COMMON MYTHS ABOUT STIs IN PREGNANCY

Myth 1: STIs Always Show Symptoms

False. Many are silent.

Myth 2: Pregnancy Protects Against STIs

False. Pregnancy does not prevent infection.

Myth 3: Herbs Can Cure STIs

False. STIs require correct medical diagnosis and treatment.

Myth 4: Treating Only the Woman Is Enough

False. Untreated partners can cause reinfection.

Myth 5: An STI Diagnosis Means a Woman Is “Bad”

False. STIs are medical conditions, not moral labels.

KEY MESSAGES EVERY PREGNANT WOMAN SHOULD KNOW

STIs in pregnancy are common, often silent, and potentially dangerous, but many can be treated or controlled. Every pregnant woman deserves confidential testing, respectful counseling, safe treatment, partner care, and newborn protection. Early antenatal care remains one of the strongest defenses against infection-related pregnancy complications.

CONCLUSION

Sexually transmitted infections during pregnancy are powerful because they can hide quietly while threatening two lives. Yet they are also among the most preventable and manageable pregnancy risks when healthcare systems act early.

The path to safety is clear: test early, treat correctly, involve partners, prevent reinfection, monitor the baby, and protect the newborn. With knowledge, compassion, and quality antenatal care, mothers can overcome fear and protect their babies from preventable harm.

ABOUT THE AUTHOR


Dr. Abiazim Chima is a medical doctor, maternal health advocate, healthcare educator, and Founder of Mother Healthcare Hospital and Diagnostics. He is passionate about maternal and child health, disease prevention, community health education, and empowering families with evidence-based healthcare information. Through MOTHER HEALTHCARE, he promotes health awareness, safe motherhood, and improved healthcare outcomes across communities.

DISCLAIMER

This article is published by MOTHER HEALTHCARE for educational and informational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Readers are encouraged to consult qualified healthcare professionals for personalized medical guidance. In case of a medical emergency, seek immediate medical attention.

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