The term TORCH complex or TORCHes infection refers to the congenital infections of toxoplasmosis, others(Syphilis, Hepatitis B), rubella, Cytomegalovirus (CMV), and herpes simplex. These are caused by Toxoplasma gondii, Treponema pallidum, Hepatitis B virus, Rubella virus, cytomegalovirus, and herpes virus simplex (HSV) viruses respectively. Other pathogens associated with congenital infections include human immunodeficiency virus (HIV), parvovirus, and varicella virus.
It is the intrauterine transmission of these infections to the fetus which produces multiple symptoms when the child is born. Maternal risk factors include lapsed immunizations, sexually transmitted infections, and animal exposures during pregnancy. The timing of maternal infection if a key epidemiologic factor because fetal damage usually depends on the gestational age. With the exception of HSV, infections during the first trimester have the worst outcome.
The TORCH infections include causative organisms Toxoplasma gondii, rubella virus, cytomegalovirus, HSV 1 and 2, hepatitis B virus, HIV, and others like syphilis, parvovirus, and varicella. Transmission of the pathogens may occur prenatally by the transplacental route, perinatally by blood or vaginal secretions. Postnatal infections tend to be less impactful. Others, such as HIV, hepatitis B, and syphilis, can be transmitted via sexual contact to a susceptible mother. Rubella and varicella can be prevented by properly immunizing mothers.
Approximately 2% to 3% of all congenital anomalies are attributed to perinatal infections. Initial evidence of infection may be seen during the intrauterine period, at birth, in infancy, or not even until years later. Intrauterine manifestations of congenital infections include abnormal growth parameters or developmental abnormalities. The infected newborn infants may show abnormal growth, developmental anomalies, or multiple clinical and laboratory abnormalities.
Many of the clinical syndromes for those viruses that present in the immediate neonatal period overlap with each other. They usually cause a rash, which can be maculopapular, petechial (blueberry muffin rash), or purpuric. Microcephaly, sensorineural hearing loss (particularly with CMV), and chorioretinitis may be present. Hepatosplenomegaly and cardiac anomalies are also frequent findings.
The incidence of maternal CMV and toxoplasmosis are 2 to 10 per 1000 births. Rubella is common in countries where mothers are unvaccinated but only occurs in the United States in cases of imported disease after universal immunization. Humans are the natural hosts for the herpes virus, and the newborns usually get HSV-2 as it predominantly causes genital infections. Risk factors for toxoplasmosis include exposure to cats and the ingestion of improperly prepared foods such as undercooked meat or unpasteurized dairy products. Raw vegetables served in the restaurant probably caused toxoplasmosis in Brazil.
Toxoplasma gondii oocysts transmission occurs by ingesting the infected tissue or inhaling the fecal particles. Transplacental transmission causes congenital toxoplasmosis. This is most commonly occurs in the third trimester of pregnancy. However, earlier the infection, more severe will be the congenital malformations.
Syphilis is transmitted through the placenta or vertically in the birth canal. The transmission rate is more than 80% in recently infected mothers.
Rubella is transmitted to the mother by aerosols and to the fetus through the placenta.
CMV transmits to the mother by blood transfusion, organ transplants, or most commonly through the mucus membrane exposure. It then passes either through the placenta, birth canal, or breast milk to the fetus or neonate. CMV infection rates in primary infection have long been proposed to be greater than secondary infection, but there has been some recent analysis that this may not be as significant as previously thought.
HSV transmits to the mother by sexual contact and later to the fetus via either ascending infection or exposure during parturition. Maternal primary infection during the third trimester has the highest percentage of neonatal infection. Secondary reactivation of HSV is 10 to 30 times less likely to result in transmission to the infant.
HIV transmission to infants can occur either in transplacentally in utero, during parturition, or via post-natal maternal exposures like breast milk.
Maternal history is a key area of investigation for patients who have a concern for congenital infections. The history of a febrile illness with or without rashes and poor maternal weight gain could raise concern for clinicians. Furthermore, fetal abnormalities such as intracranial calcifications may be detected in routine, or specific maternal testing may occur. Fetal loss can occur, particularly with infections during the first trimester.
The history and physical findings for each individual TORCH pathogen are listed below: In general, a physical exam may reveal rashes, low birth weight, microcephaly, findings suggestive of cardiac abnormalities (murmurs), chorioretinitis and cataracts, and intracranial calcifications.
Toxoplasmosis: The primary manifestations of congenital toxoplasmosis include intrauterine growth restriction and low birth weight, hepatosplenomegaly, jaundice, chorioretinitis, intraparenchymal calcifications, and anemia. Less commonly, petechiae, hydrocephalus, and microcephaly can be found.
Congenital rubella syndrome: It includes low birth weight, hepatosplenomegaly, cataracts, congenital heart disease (patent ductus arteriosus, and ventricular septal defect), and a petechial rash. Congenital sensorineural hearing loss is very common.
Herpes simplex virus: HSV rarely presents with in utero infection but instead presents due to perinatal exposure. Therefore, clinical manifestations normally will present ten to twenty-one days after infection. There are three major manifestations: Skin-eye-mucous membranes (SEM), central nervous system (CNS), and disseminated disease. All will often present with fever in the neonatal period. The disseminated disease will present earliest after approximately one week of age. These children will present with a sepsis-like syndrome with skin lesions to include vesicles, hypotension, hepatosplenomegaly, and lethargy. These patients often have evidence of meningoencephalitis. SEM disease is thought to be limited to a rash, normally vesicular, and is often noted in areas of trauma such as fetal scalp electrodes or the use of forceps with delivery. CNS disease is more likely to present with lethargies or perhaps seizures. All patients should be evaluated for evidence of disease, including the CNS.
Cytomegalovirus: CMV is the most common congenital infection. It will present with intrauterine growth restriction and low birth weight, hepatosplenomegaly, jaundice, paraventricular calcifications, cataracts, and sensorineural hearing loss and bone marrow suppression that will present with thrombocytopenia and anemia. Patients often have a petechial rash at birth.
HIV: Patients with congenital HIV rarely have any evidence of outward manifestations at birth. They may have a low birth weight and hepatosplenomegaly at birth.
Syphilis: In utero, there may be fetal loss or hydrops fetalis. In the neonatal period, children with primary syphilis may present with cutaneous lesions on the palms and soles, hepatosplenomegaly, jaundice, inflammation of the umbilical cord (funisitis) and discharge from the nose (sniffles). Periostitis may be found on x-rays of the bones. Late findings include frontal bossing, high palatal arch, sensorineural hearing loss, a saddle nose, perioral fissures, and Hutchinson teeth.
The TORCH titer is a test that is often run in this setting. Basically, it is usually a panel of IgG tests for the pathogens noted. It may provide some useful insight into whether a mother has been infected if high titers are detected, it is not that useful in making a definitive diagnosis of any pathogen associated with congenital infections. Therefore, the investigation of each pathogen is warranted if the clinical syndrome is suggestive of that disease. The evaluation of each illness is noted in the following passages.
Toxoplasmosis: In newborns with a concern for congenital toxoplasmosis, evaluation should include laboratory testing, consultations, and radiologic studies. Due to the possibility of ocular involvement, an ophthalmologist should be consulted to assess for possible chorioretinitis. Neuroimaging studies should be conducted to assess intracranial calcifications and/or hydrocephalus. Laboratory testing can be a bit complicated. The most sensitive and specific testing includes a mixture of tests to assess for IgA, IgG, and IgM. Most experts recommend the use of a reference laboratory that can assess the newborn with IgG (Dye test), IgM ISAGA, and IgA ELISA. If the child has not been born, maternal testing can also be conducted, which may include either an Avidity panel or a differential agglutination test depending on the week of pregnancy.
Congenital rubella syndrome: If concerns exist for this infectious syndrome, consultations with specialists and laboratory testing should occur. In order to investigate for clinical stigmata, ophthalmology (cataracts, glaucoma) and cardiology (patent ductus arteriosus (PDA), ventriculoseptal defect (VSD), and pulmonary artery stenosis) should be consulted early in the patient's course. As hearing loss is very common, audiology consultation with hearing tests should be conducted in all patients. Laboratory testing could include attempts to culture the virus from the nasopharynx or the assessment for IgM in the newborn.
Congenital cytomegalovirus: Evaluation of the being considered for the diagnosis of congenital CMV, should begin with confirmation of CMV infection. Infection is usually confirmed by the isolation of the virus within the first month of life. While any sterile site can be used, the urine is the most common source of isolation. Traditional viral culture or PCR testing is sufficient. CMV has been found in the blood and CSF as well. After confirmation, subspecialty consultation with ophthalmology (cataracts, chorioretinitis) and audiology (hearing loss) are essential. The workup usually includes neuroimaging to assess for the presence or absence of intracranial, periventricular calcifications. Laboratory evaluation should include assessment for liver transaminitis as well as liver function and bone marrow suppression by obtaining chemistries, liver function tests, PT/PTT, and a complete blood count.
Herpes simplex virus infections: Any child who presents with a concern for neonatal HSV should be aggressively evaluated. They should undergo a complete sepsis evaluation to include a lumbar puncture. It is recommended that swabs from the mouth, nasopharynx, conjunctivae, and anus. Be obtained for HSV culture and PCR. If skin vesicles are present, they should be unroofed and sent for culture and PCR as well. CSF and whole blood should also be sent for HSV culture and PCR. Measurement of liver transaminases should be conducted as they are an early clue that disseminated disease may be present. Further evaluation and consultation may depend on the type of infection the child has to include consultation with ophthalmology, neurology, and audiology. Hearing tests must be conducted as they may help with decision-making with regard to treatment.
HIV: Patients with concern for mother-to-child transmission of HIV should be evaluated. Children should have a PCR test sent at birth as infants will receive transplacental antibodies from their mothers. The first PCR can be sent within the first two days of life to determine if in utero infection occurred. Children are considered HIV negative if they have two tests conducted, and negative, after two weeks of age with one after four weeks of age. Alternatively, one negative PCR obtained after eight weeks is sufficient. Children should not breastfeed. Obtaining a complete blood count and baseline chemistries to include renal and hepatic function is also warranted. Complete guidance can be found at the U.S. Department of Health and Human Services.
Syphilis: The evaluation of a child with congenital syphilis depends on whether the mother was diagnosed during pregnancy and properly treated or not. All children should have a rapid plasma reagin (RPR) to be compared to the mother's RPR titer. If a mother is inadequately treated during pregnancy or the child has evidence of an elevated RPR with findings consistent with syphilis, the child needs a robust evaluation. The evaluation includes a complete blood count, CSF examination for cell count, protein, and venereal disease research laboratory (VDRL). Additionally, long bone radiographs, neuroimaging, ophthalmologic examination, liver function testing, and hearing tests can be conducted.
Here are the management considerations for TORCH infections:
As many of these illnesses have similar manifestations, they are often all considered as a possible diagnosis when a child presents with signs and symptoms suggestive of congenital infection. Therefore, in a child who presents small for gestational age with additional clinical findings such as a rash or heart murmur or ocular findings, all of the TORCH complex pathogens should be considered. In addition to those mentioned, the new pathogen Zika virus can cause significant disease in newborns. In particular, the virus causes CNS disease that is significant and can present with intracranial calcifications. Parvovirus B19 infection can also cause fetal hydrops fetalis and can present with profound bone marrow suppression.
Maternal factors such as preeclampsia, hypertension, smoking, drug and medication use, and anemia may contribute to growth problems. Additionally, many metabolic and genetic syndromes can present in a similar manner to a TORCH infection. These may range from common issues like hypothyroidism to much more complex and rare genetic syndromes.
The prognosis for congenital infections will vary depending on the severity of the initial presentation. For toxoplasmosis, there may be findings at birth, such as intracranial calcifications and chorioretinitis, which may suggest a poor prognosis with seizures and developmental delay likely. Unfortunately, there may be some long-term problems detected, such as school dysfunction, hearing and visual issues, and gross motor problems that require close monitoring. Patients with congenital rubella syndrome continue to have a poor prognosis with multiple organ systems impacted to include cardiac malformations, hearing loss, cataracts, and brain anomalies. Long-term followup portends a poor prognosis, particularly in children with cardiac disease.
The prognosis of patients with congenital cytomegalovirus is variable. Some patients with a congenital infection have extremely good outcomes and are relatively asymptomatic. On the other hand, children with CNS disease at presentation are at high risk for sensorineural hearing loss and developmental delays. If valganciclovir can be administered to symptomatic newborns in a timely manner, it has shown value.
Patients with neonatal HSV infections will have an outcome that is dependent on the presentation as well. With the advent of the aggressive use of acyclovir in the neonatal period plus the use of suppressive acyclovir for six months, long-term outcomes have improved for neurologic outcomes. The outcome for patients presenting with the disseminated disease remains grim. Patients with syphilis will have good outcomes as long as they are recognized and diagnosed at birth and receive the correct and prompt therapy.
Complications are intrauterine and postnatal. In utero complications include intrauterine growth retardation, hydrops fetalis, and intrauterine death. Postnatal complications include failure to thrive, ophthalmologic disease, developmental delay, paralysis, seizure disorders, hearing loss, congenital heart diseases, and death. Congenital infections are the number one cause of sensorineural hearing loss in children.
Children who are noted to be suffering from intrauterine growth restriction should be followed by a perinatologist to investigate reasons for this finding to include TORCH pathogens. Neonatology should be consulted as they may be needed to assist with delivery and care after the birth of the child. A pediatric infectious disease physician should be consulted to assist with testing and potential treatment of pathogens. Due to the findings that are common with TORCH infections, consultation with ophthalmology, audiology, radiology, cardiology, gastroenterology, and hematology/oncology may be warranted.
Maternal education and early in utero diagnosis is very important in diagnosing a child with a TORCH infection. Early intervention may allow for the treatment during pregnancy (toxoplasmosis and syphilis) or prophylaxis at delivery (HSV) to help eliminate risk to the newborn. Regular prenatal care and maternal health are key elements for any pregnancy. All women of childbearing age should ensure that they have their immunizations up to date as this can prevent any possibility of congenital rubella syndrome.
Safe sexual practices can help eliminate the risk of the acquisition of syphilis, HIV, and HSV during pregnancy. Expectant mothers who have a febrile illness during pregnancy should be sure to report that illness to their physicians. Safe eating practices such as the avoidance of processed foods (deli meats) and eating thoroughly cooked foods can help prevent the transmission of toxoplasmosis. Similarly, expectant mothers should refrain from cleaning the cat litter boxes during pregnancy to prevent the transmission of toxoplasmosis. The prevention of cytomegalovirus has focused on the area of hygiene, encouraging expectant mothers to avoid situations such as child care settings or nursing care when possible. When not possible, hand hygiene is essential. Some recent reports have looked at the use of immunoglobulin to prevent the transmission of CMV to the fetus and show some promise.
Interprofessional relation between obstetricians and neonatologists is critical in maternal and fetal management. Early recognition of the disease and appropriate management may reduce maternal and fetal morbidity and mortality. Prevention guidelines should be given to mothers by their obstetrician. Radiologists can identify defects in the pregnancy and report to the parents so that they can make informed choices. Neonatologists can easily identify the defects in the child and counsel parents. Intradisciplinary communication is paramount as a large number of consultations may be necessary and coordinated communication within the healthcare team, and with parents will be necessary.
Evidence levels exist at many levels. The evaluation and treatment of toxoplasmosis, syphilis, CMV, and HSV are all supported by large randomized clinical trials with clear cut results. There are also many cohort and case-control studies and historical cohort or case-control studies that support the information given in this paper.
|||Singh L,Mishra S,Prasanna S,Cariappa MP, Seroprevalence of TORCH infections in antenatal and HIV positive patient populations. Medical journal, Armed Forces India. 2015 Apr [PubMed PMID: 25859075]|
|||Stegmann BJ,Carey JC, TORCH Infections. Toxoplasmosis, Other (syphilis, varicella-zoster, parvovirus B19), Rubella, Cytomegalovirus (CMV), and Herpes infections. Current women's health reports. 2002 Aug; [PubMed PMID: 12150751]|
|||Palma S,Roversi MF,Bettini M,Mazzoni S,Pietrosemoli P,Lucaccioni L,Berardi A,Genovese E, Hearing loss in children with congenital cytomegalovirus infection: an 11-year retrospective study based on laboratory database of a tertiary paediatric hospital. Acta otorhinolaryngologica Italica : organo ufficiale della Societa italiana di otorinolaringologia e chirurgia cervico-facciale. 2019 Feb [PubMed PMID: 30936577]|
|||Newton ER, Diagnosis of perinatal TORCH infections. Clinical obstetrics and gynecology. 1999 Mar; [PubMed PMID: 10073301]|
|||McLeod R,Boyer K,Roizen N,Stein L,Swisher C,Holfels E,Hopkins J,Mack D,Karrison T,Patel D,Pfiffner L,Remington J,Withers S,Meyers S,Aitchison V,Mets M,Rabiah P,Meier P, The child with congenital toxoplasmosis. Current clinical topics in infectious diseases. 2000 [PubMed PMID: 10943525]|
|||[PubMed PMID: 32013639]|
|||Cabral Monica T,Pinto-Ferreira F,Martins FDC,de Matos RLN,de Matos AMRN,Santos AC,Nino BSL,Pereira L,Narciso SG,Garcia JL,Freire RL,Navarro IT,Mitsuka-Bregano R, Epidemiology of a toxoplasmosis outbreak in a research institution in northern Paraná, Brazil. Zoonoses and public health. 2020 Apr 29; [PubMed PMID: 32347668]|
|||Saso A,Bamford A,Grewal K,Noori M,Hatcher J,D'Arco F,Guy E,Lyall H, Fifteen-minute consultation: Management of the infant born to a mother with toxoplasmosis in pregnancy. Archives of disease in childhood. Education and practice edition. 2020 Feb 18; [PubMed PMID: 32071105]|
|||Slutsker JS,Hennessy RR,Schillinger JA, Factors Contributing to Congenital Syphilis Cases - New York City, 2010-2016. MMWR. Morbidity and mortality weekly report. 2018 Oct 5 [PubMed PMID: 30286056]|
|||Pereira L, Congenital Viral Infection: Traversing the Uterine-Placental Interface. Annual review of virology. 2018 Sep 29 [PubMed PMID: 30048217]|
|||Maltezou PG,Kourlaba G,Kourkouni Ε,Luck S,Blázquez-Gamero D,Ville Y,Lilleri D,Dimopoulou D,Karalexi M,Papaevangelou V, Maternal type of CMV infection and sequelae in infants with congenital CMV: Systematic review and meta-analysis. Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology. 2020 Jun 27 [PubMed PMID: 32622333]|
|||Pass RF,Arav-Boger R, Maternal and fetal cytomegalovirus infection: diagnosis, management, and prevention. F1000Research. 2018 [PubMed PMID: 29560263]|
|||Belanger BG,Lui F, Embryology, Teratology TORCH 2020 Jan; [PubMed PMID: 31424732]|
|||[PubMed PMID: 23359576]|
|||Yah CS,Tambo E, Why is mother to child transmission (MTCT) of HIV a continual threat to new-borns in sub-Saharan Africa (SSA). Journal of infection and public health. 2019 Mar - Apr [PubMed PMID: 30415979]|
|||Grant GB,Desai S,Dumolard L,Kretsinger K,Reef SE, Progress Toward Rubella and Congenital Rubella Syndrome Control and Elimination - Worldwide, 2000-2018. MMWR. Morbidity and mortality weekly report. 2019 Oct 4; [PubMed PMID: 31581161]|
|||Pomares C,Montoya JG, Laboratory Diagnosis of Congenital Toxoplasmosis. Journal of clinical microbiology. 2016 Oct [PubMed PMID: 27147724]|
|||Yazigi A,De Pecoulas AE,Vauloup-Fellous C,Grangeot-Keros L,Ayoubi JM,Picone O, Fetal and neonatal abnormalities due to congenital rubella syndrome: a review of literature. The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians. 2017 Feb [PubMed PMID: 27002428]|
|||Marsico C,Kimberlin DW, Congenital Cytomegalovirus infection: advances and challenges in diagnosis, prevention and treatment. Italian journal of pediatrics. 2017 Apr 17 [PubMed PMID: 28416012]|
|||Pinninti SG,Kimberlin DW, Management of neonatal herpes simplex virus infection and exposure. Archives of disease in childhood. Fetal and neonatal edition. 2014 May [PubMed PMID: 24589428]|
|||Cooper JM,Sánchez PJ, Congenital syphilis. Seminars in perinatology. 2018 Apr [PubMed PMID: 29627075]|
|||Lazzarotto T,Blázquez-Gamero D,Delforge ML,Foulon I,Luck S,Modrow S,Leruez-Ville M, Congenital Cytomegalovirus Infection: A Narrative Review of the Issues in Screening and Management From a Panel of European Experts. Frontiers in pediatrics. 2020; [PubMed PMID: 32083040]|
|||McPherson CC, Neonatal Herpes Simplex Virus: The Long Road to Improved Outcomes. Neonatal network : NN. 2020 Mar 1; [PubMed PMID: 32317339]|
|||Kimberlin DW,Jester PM,Sánchez PJ,Ahmed A,Arav-Boger R,Michaels MG,Ashouri N,Englund JA,Estrada B,Jacobs RF,Romero JR,Sood SK,Whitworth MS,Abzug MJ,Caserta MT,Fowler S,Lujan-Zilbermann J,Storch GA,DeBiasi RL,Han JY,Palmer A,Weiner LB,Bocchini JA,Dennehy PH,Finn A,Griffiths PD,Luck S,Gutierrez K,Halasa N,Homans J,Shane AL,Sharland M,Simonsen K,Vanchiere JA,Woods CR,Sabo DL,Aban I,Kuo H,James SH,Prichard MN,Griffin J,Giles D,Acosta EP,Whitley RJ, Valganciclovir for symptomatic congenital cytomegalovirus disease. The New England journal of medicine. 2015 Mar 5 [PubMed PMID: 25738669]|
|||[PubMed PMID: 32497029]|
|||Tahotná A,Brucknerová J,Brucknerová I, Zika virus infection from a newborn point of view. TORCH or TORZiCH? Interdisciplinary toxicology. 2018 Dec [PubMed PMID: 31762675]|
|||Bascietto F,Liberati M,Murgano D,Buca D,Iacovelli A,Flacco ME,Manzoli L,Familiari A,Scambia G,D'Antonio F, Outcome of fetuses with congenital parvovirus B19 infection: systematic review and meta-analysis. Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology. 2018 Nov [PubMed PMID: 29785793]|
|||Finken MJJ,van der Steen M,Smeets CCJ,Walenkamp MJE,de Bruin C,Hokken-Koelega ACS,Wit JM, Children Born Small for Gestational Age: Differential Diagnosis, Molecular Genetic Evaluation, and Implications. Endocrine reviews. 2018 Dec 1 [PubMed PMID: 29982551]|
|||[PubMed PMID: 16619149]|
|||Van Bang N,Van Anh NT,Van VT,Thai TT,Van Thuong N,Khandaker G,Elliott E, Surveillance of congenital rubella syndrome (CRS) in tertiary care hospitals in Hanoi, Vietnam during a rubella epidemic. Vaccine. 2014 Dec 12 [PubMed PMID: 25444828]|
|||Toizumi M,Motomura H,Vo HM,Takahashi K,Pham E,Nguyen HA,Le TH,Hashizume M,Ariyoshi K,Dang DA,Moriuchi H,Yoshida LM, Mortality associated with pulmonary hypertension in congenital rubella syndrome. Pediatrics. 2014 Aug [PubMed PMID: 25002666]|
|||Acosta E,Bowlin T,Brooks J,Chiang L,Hussein I,Kimberlin D,Kauvar LM,Leavitt R,Prichard M,Whitley R, Advances in the Development of Therapeutics for Cytomegalovirus Infections. The Journal of infectious diseases. 2020 Mar 5 [PubMed PMID: 32134483]|
|||[PubMed PMID: 21991950]|
|||Kimberlin DW,Lin CY,Jacobs RF,Powell DA,Frenkel LM,Gruber WC,Rathore M,Bradley JS,Diaz PS,Kumar M,Arvin AM,Gutierrez K,Shelton M,Weiner LB,Sleasman JW,de Sierra TM,Soong SJ,Kiell J,Lakeman FD,Whitley RJ, Natural history of neonatal herpes simplex virus infections in the acyclovir era. Pediatrics. 2001 Aug [PubMed PMID: 11483781]|
|||Brock R,Edwards B,Lu S,Chu A,Somayaji R, Clinical characteristics and outcomes for paediatric patients admitted with congenital or acquired syphilis: a population-based cohort study. Sexually transmitted infections. 2020 May 20 [PubMed PMID: 32434906]|
|||Leung KKY,Hon KL,Yeung A,Leung AKC,Man E, Congenital infections in Hong Kong: an overview of TORCH. Hong Kong medical journal = Xianggang yi xue za zhi. 2020 Apr; [PubMed PMID: 32245914]|
|||Terracciano E,Amadori F,Pettinicchio V,Zaratti L,Franco E, Strategies for elimination of rubella in pregnancy and of congenital rubella syndrome in high and upper-middle income countries. Journal of preventive medicine and hygiene. 2020 Mar [PubMed PMID: 32490275]|
|||[PubMed PMID: 30103893]|
|||Kagan KO,Hamprecht K, Cytomegalovirus infection in pregnancy. Archives of gynecology and obstetrics. 2017 Jul [PubMed PMID: 28508343]|
|||Kagan KO,Enders M,Schampera MS,Baeumel E,Hoopmann M,Geipel A,Berg C,Goelz R,De Catte L,Wallwiener D,Brucker S,Adler SP,Jahn G,Hamprecht K, Prevention of maternal-fetal transmission of cytomegalovirus after primary maternal infection in the first trimester by biweekly hyperimmunoglobulin administration. Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology. 2019 Mar [PubMed PMID: 29947159]|