TORCH Infections in Pregnancy: An India Guide for Worried Parents

• TORCH is a teaching mnemonic (Toxoplasmosis, Other, Rubella, CMV, Herpes), not a single disease or a test you automatically need.
• A positive IgG usually means past infection and lasting immunity, which is generally protective, not bad news.
• A positive IgM on a screening panel is very often a false positive and never, on its own, a reason to end a pregnancy.
• Leading guidelines (ACOG, RCOG, NICE, CDC and increasingly FOGSI) advise against routine TORCH panels in healthy, low-risk women.
• The screening that genuinely helps every Indian pregnancy is for HIV, syphilis and hepatitis B, all of which have proven treatments.
• Pre-conception immunity (rubella, chickenpox), simple food and hygiene habits, and targeted testing protect more babies than blanket TORCH testing ever could.

TORCH is a memory aid that clinicians have used since the 1970s. It stands for Toxoplasmosis, Other, Rubella, Cytomegalovirus (CMV) and Herpes simplex virus (HSV). These organisms are grouped together because they share three features: they can pass from mother to baby across the placenta or during birth, they can cause a recognisable pattern of birth defects, and they often cause only mild or no illness in the mother while still harming the baby.

The "O" for "Other" has grown over the years to include syphilis, hepatitis B, chickenpox (varicella), parvovirus B19, HIV and, more recently, Zika virus. So TORCH is a checklist for thinking, not a fixed test. The panel most Indian labs sell usually covers only the original four to five organisms as IgG and IgM antibodies.

The shared congenital pattern these infections can cause includes restricted growth in the womb, a small head (microcephaly), calcium deposits in the brain, eye inflammation, hearing loss, an enlarged liver and spleen, low platelets, jaundice, rash and developmental delay. Because the mother may feel completely well, an abnormal scan or an affected newborn is sometimes the first clue. The crucial point is that the mnemonic tells us what to consider when there is a real concern — it does not mean every pregnant woman should be tested for everything.

Toxoplasma gondii is a parasite. Cats are its main host, but people usually get infected by swallowing the parasite from contaminated soil, unwashed garden produce or cat litter, or by eating undercooked meat (especially pork, lamb, goat and venison). In Indian women of reproductive age, roughly 15 to 50 percent already carry antibodies, with higher rates in non-vegetarian communities.

Most infections cause no symptoms; some bring a mild flu-like illness with low fever, tiredness and swollen neck glands. If a woman catches it for the first time during pregnancy, the chance of passing it to the baby rises through pregnancy (around 10 to 15 percent in the first trimester to 60 to 70 percent in the third). The severity runs the other way: early infection is rare but can cause serious brain and eye damage, while late infection is common but often silent at birth.

Diagnosing a genuinely new infection needs more than a single antibody test. It requires seeing IgG turn from negative to positive, or IgM with low IgG avidity confirmed at a reference lab. A single positive IgG only means past exposure and lifelong immunity, which actually protects the pregnancy. IgM alone is unreliable because it can linger for months and is prone to false positives.

Prevention is simple and applies to everyone, whatever the test shows: cook meat thoroughly, wash fruits and vegetables, wear gloves when gardening, and let someone else change the cat litter during pregnancy.

Rubella (German measles) is mild in children and adults but devastating if caught in early pregnancy. Congenital rubella syndrome can cause deafness, cataracts, heart defects, a small head, intellectual disability and growth restriction. The risk is highest before 12 weeks, when infection carries up to an 85 to 90 percent chance of serious fetal defects; it falls to about 25 percent at 13 to 16 weeks and is uncommon after 20 weeks.

India rolled out the Measles-Rubella vaccine in 2017, but many adult women born earlier have uncertain immunity. FOGSI recommends checking rubella IgG before planning pregnancy. Women who are not immune should get the MMR vaccine at least one month — ideally three — before trying to conceive, because MMR is a live vaccine and cannot be given during pregnancy. This is one of the key shots covered in our guide to preconception vaccines for Indian couples.

Rubella IgG testing costs roughly Rs 400 to Rs 800 privately; the MMR vaccine is around Rs 200 to Rs 400 and free at government centres. During an established pregnancy, rubella testing mainly identifies women who should be vaccinated after delivery to protect future pregnancies. A positive rubella IgM in a woman with no rash and no exposure is usually a false positive and needs reference-lab confirmation, not alarm or talk of termination.

CMV is the most common congenital infection worldwide and an important cause of childhood hearing loss and developmental delay. In Indian women of reproductive age, 80 to 95 percent already carry CMV antibodies from childhood exposure, which is exactly why a positive IgG here means almost nothing on its own.

CMV spreads through body fluids — saliva, urine, breast milk, blood, sexual contact. Toddlers in daycare are a common source for mothers. A first (primary) infection in pregnancy carries about a 30 to 40 percent chance of reaching the baby, and roughly 10 to 15 percent of infected babies have symptoms at birth such as a small head, brain calcifications, an enlarged liver, jaundice and hearing loss. Importantly, CMV can also pass on from a reactivated or re-infection, though the risk is much lower than a first infection.

This is why CMV serology is so hard to read in India. A positive IgG just reflects very common past exposure; a positive IgM can persist for months. When a new infection is genuinely suspected, IgG avidity testing is essential — high avidity rules out recent infection, low avidity supports it. ACOG, RCOG and CDC do not recommend routine CMV screening, because there is no licensed vaccine, no proven womb treatment outside specialist settings, and confirming fetal infection needs an Amniocentesis in India: When It's Needed, Risks, Results & NIPT. The best protection is hygiene: wash hands after nappy changes and after contact with a toddler's saliva or urine, and avoid sharing spoons and cups with young children.

Herpes simplex comes in two types: HSV-1 (usually oral) and HSV-2 (usually genital), though either can affect either site. The risk to a baby — neonatal herpes — comes mainly during a vaginal birth, through contact with active genital sores or viral shedding. It is uncommon but can be very serious, which is why our guide to neonatal herpes is worth reading if you have a history of genital herpes.

In India, HSV-1 antibodies are very common (60 to 80 percent) and HSV-2 less so (around 5 to 15 percent). The single highest-risk situation is a woman catching genital herpes for the first time in the third trimester, close to delivery, before she has made protective antibodies. Recurrent herpes in someone who already has antibodies carries a much lower risk to the baby.

Routine TORCH-style HSV antibody testing in women without symptoms is not recommended by ACOG, RCOG or NICE, because a positive IgG only reflects past exposure and IgM is unreliable. What actually helps is honest discussion: tell your obstetrician about any history of genital herpes (yours or your partner's), get examined for active sores at the time of labour, and consider suppressive acyclovir from 36 weeks if you have recurrent genital herpes. A caesarean is advised if there are active genital lesions or warning symptoms when labour begins. A history of oral cold sores alone needs no special precautions.

• Syphilis — screened with VDRL or RPR at the first antenatal visit (and again later in high-risk women) under FOGSI and WHO guidance. Untreated syphilis causes stillbirth and severe congenital disease, but timely penicillin prevents it. See our guide to syphilis in Indian women.
• HIV — universally offered in Indian antenatal care under the PPTCT programme. Treatment and planned delivery cut mother-to-child transmission from 25 to 30 percent down to under 2 percent. Read more on HIV and pregnancy.
• Hepatitis B — universal screening, with a birth-dose vaccine and immunoglobulin for babies of positive mothers to block transmission.
• Parvovirus B19 (slapped-cheek disease) — can cause fetal anaemia and hydrops; tested only after exposure or an abnormal scan, not routinely.
• Chickenpox (varicella) — can cause congenital varicella syndrome in early pregnancy and severe newborn disease near delivery. Non-immune women should be vaccinated before conceiving. See chickenpox in pregnancy.
• Zika virus — relevant mainly for travel to endemic areas; avoid such travel in pregnancy and for two months before trying to conceive.

International guidelines from ACOG, RCOG, NICE, SMFM and CDC consistently advise against routine TORCH panels for healthy, low-risk pregnant women. The reasons are practical:

Most Indian women are IgG-positive for several TORCH organisms simply from childhood exposure — and IgG positivity means immunity, not active disease. Reporting it without explanation creates needless panic and a cascade of repeat tests. IgM testing, meanwhile, is notoriously prone to false positives from cross-reactions, rheumatoid factor and recent infections, so a positive IgM in a woman with no symptoms is more likely false than real.

Even when a new infection is correctly diagnosed, confirming that the baby is affected usually needs invasive testing, and treatment options are limited for several of these organisms. Screening therefore offers false reassurance for negatives and disproportionate fear for positives, with no improvement in outcomes. Most worryingly, in some Indian practices, positive TORCH results have led to the termination of perfectly healthy pregnancies on serology alone.

The right approach is targeted testing: order tests when there is a specific reason — symptoms of acute infection (rash, fever, swollen glands), known exposure to an infected contact, or worrying findings on the anomaly scan such as growth restriction, a small head, brain calcifications or hydrops. When you do test, interpret with avidity testing and reference-lab confirmation, and involve a fetal-medicine specialist before any decisions.

• Clinical assessment — a detailed history of symptoms, exposures, travel and occupation, plus examination and a review of scan findings.
• Confirmatory testing — IgG, IgM and avidity testing at a reference laboratory (such as AIIMS, PGIMER Chandigarh, NIV Pune, SRL, Metropolis or Apollo Diagnostics), rather than acting on a screening result.
• Specialist referral — to a maternal-fetal medicine unit at a centre like Fernandez, Cloudnine, Manipal, Rainbow, Fortis, AIIMS, PGI, JIPMER or CMC Vellore.
• Targeted fetal ultrasound — a detailed level-II scan looking at growth, brain anatomy, calcifications, liver and spleen, and hydrops, with amniocentesis and PCR considered to confirm fetal infection.
• Shared decision-making — options may include monitoring with serial scans, treatment where evidence supports it (spiramycin for toxoplasmosis; selected CMV care at specialist centres), or, only in confirmed severe cases, a discussion of medical termination under the MTP Act 2021.

A TORCH panel at an NABL-accredited lab usually costs Rs 2,500 to Rs 5,000 depending on the city and the organisms included; chains such as SRL, Metropolis, Dr Lal PathLabs, Thyrocare, Apollo Diagnostics and Vijaya Diagnostics all offer it. Individual tests are far cheaper — rubella IgG is roughly Rs 400 to Rs 800, syphilis VDRL Rs 200 to Rs 500, and HIV ELISA Rs 200 to Rs 600. Government antenatal clinics under PMSMA and Janani Suraksha Yojana provide HIV, syphilis and hepatitis B screening free or subsidised.

If a TORCH panel is ordered, it is reasonable to ask three questions: what specific concern prompted this test, what will the result change in my care, and how will a positive or negative result be interpreted? If it is being done purely as routine, you are entitled to discuss whether you actually need it.

And if you do get a positive IgM on a screening test, do not panic and do not agree to termination on that basis. Ask for IgG avidity testing, reference-lab confirmation, a fetal-medicine consult and a detailed scan before any decision. Understanding your reports is easier with our guide to pregnancy blood tests at the first visit.

Preventing congenital infection is far more effective than screening for it afterwards, and most of it is simple, cheap and within your control.

Before pregnancy is the most important window. Confirm rubella and chickenpox immunity and complete any needed vaccines at least three months before trying to conceive. Update Tdap. Discuss HIV, syphilis and hepatitis B status with your partner. Taking folic acid before conception is part of the same pre-pregnancy preparation.

During pregnancy, protect yourself with everyday habits. For CMV, wash hands carefully around toddlers' saliva and urine and don't share their cups or spoons. For toxoplasmosis, cook meat thoroughly, wash produce, wear gardening gloves and avoid the cat litter. For HSV, have an honest conversation with your partner and obstetrician, and use suppressive therapy from 36 weeks if you have recurrent genital herpes. Universal screening for HIV, syphilis and hepatitis B remains a sensible, standard part of STI screening in pregnancy.

The combination of pre-conception immunity, simple hygiene, sensible food handling and targeted screening for treatable infections protects far more babies than indiscriminate TORCH testing ever could. To see where infection testing fits into the wider picture, our overview of congenital diseases and birth defects puts it in context.

• ACOG Practice Advisory: Cytomegalovirus, Parvovirus B19, Varicella Zoster, and Toxoplasmosis in Pregnancy
• RCOG Green-top Guideline No. 30: Management of Genital Herpes in Pregnancy
• WHO: Congenital rubella syndrome and rubella vaccines
• CDC: Cytomegalovirus (CMV) and Congenital CMV Infection
• WHO: Prevention of mother-to-child transmission of syphilis and HIV
• NACO (India): Prevention of Parent-to-Child Transmission (PPTCT) Guidelines
• Ministry of Health & Family Welfare (India): Pradhan Mantri Surakshit Matritva Abhiyan (PMSMA)