TORCH

Status: current, with caveats. The source library flags this one as still taught but qualified — read the safety notes on each component before relying on it.

A memory aid for the group of infections that can pass from a pregnant person to the fetus and cause overlapping newborn findings: Toxoplasmosis, Other, Rubella, Cytomegalovirus (CMV), Herpes simplex virus.

T — Toxoplasmosis

Toxoplasma gondii (a parasite)

Protozoan acquired from undercooked/raw meat, unwashed produce, or cat feces. Congenital disease classically causes chorioretinitis, hydrocephalus, and diffuse intracranial calcifications, plus hepatosplenomegaly, jaundice, and seizures.

Physiology. Primary maternal parasitemia crosses the placenta; the parasite has a tropism for the retina and CNS. Prior maternal infection generally confers immunity.

Safety. Prevention: avoid cat litter (or gloves + handwashing), cook meat thoroughly, wash produce, wear gloves for gardening.

O — Other

Variable list — syphilis, HIV, HBV, parvovirus B19, Zika, listeria, VZV, enterovirus (no universal expansion)

No single universal expansion. Commonly included agents: syphilis (hepatosplenomegaly, 'snuffles', rash, bone changes), HIV (vertical transmission), HBV (HBIG + vaccine at birth), parvovirus B19 (hydrops/fetal anemia), Zika (microcephaly), Listeria (fetal sepsis, from deli meat/unpasteurized cheese), VZV (congenital varicella syndrome), and enterovirus.

Physiology. TORCH is a syndrome — many pathogens produce an overlapping picture (growth restriction, microcephaly, calcifications, hepatosplenomegaly, jaundice, rash, eye/hearing defects) — and the recognized list has grown over time.

Safety. Because 'Other' is ambiguous, it must never be used as a standalone diagnostic/screening list; reference current maternal screening (syphilis/HIV/HBV) and outbreak guidance.

R — Rubella

Rubella virus ('German measles')

Congenital rubella syndrome (CRS) from first-trimester infection: sensorineural deafness (most common), cataracts, and congenital heart disease (PDA, pulmonary artery stenosis), plus growth restriction, microcephaly, and 'blueberry muffin' rash. MMR vaccination has made CRS rare.

Physiology. Rubella crosses the placenta and disrupts organogenesis in the vulnerable eyes, inner ear, and heart during the first trimester.

Safety. MMR is a live vaccine and is contraindicated in pregnancy; give it postpartum to non-immune clients.

C — Cytomegalovirus (CMV)

Cytomegalovirus (a herpes-family virus)

The most common congenital infection and a leading cause of non-genetic sensorineural hearing loss. Symptomatic disease: petechiae, jaundice, hepatosplenomegaly, microcephaly, periventricular calcifications, chorioretinitis, growth restriction. Spread via saliva/urine (esp. young children).

Physiology. CMV is shed in saliva and urine for long periods, making pregnant caregivers of young children highest risk; the virus targets the developing inner ear and brain.

Safety. Congenital CMV hearing loss can be progressive and may not be present at birth — serial hearing follow-up is required even with a normal newborn screen.

H — Herpes simplex virus (HSV)

Herpes simplex virus (HSV-1/HSV-2)

Neonatal herpes is usually acquired during vaginal delivery from active maternal lesions (highest risk with primary infection). Three forms: SEM (skin/eyes/mouth), CNS (encephalitis), and disseminated (most severe). Prevention: cesarean for active lesions at labor, acyclovir suppression for recurrent herpes late in pregnancy.

Physiology. The newborn's immature immune system cannot contain HSV, which disseminates rapidly; transferred maternal antibodies (in recurrent infection) reduce but do not eliminate risk.

Safety. Neonatal HSV can present without skin lesions (CNS/disseminated) — maintain a high index of suspicion; treat on suspicion with IV acyclovir.

Memory aids

• T = Toxoplasmosis
• O = Other
• R = Rubella
• C = Cytomegalovirus (CMV)
• H = Herpes simplex virus (HSV)

Quick review

• T = Toxoplasmosis — Toxoplasma gondii (a parasite)
• O = Other — Variable list — syphilis, HIV, HBV, parvovirus B19, Zika, listeria, VZV, enterovirus (no universal expansion)
• R = Rubella — Rubella virus ('German measles')
• C = Cytomegalovirus (CMV) — Cytomegalovirus (a herpes-family virus)
• H = Herpes simplex virus (HSV) — Herpes simplex virus (HSV-1/HSV-2)