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Grammatikopoulou MG, Vassilakou T. Nutrition in Pediatric Patients and Vulnerable Populations: Updates and Advances. CHILDREN (BASEL, SWITZERLAND) 2024; 11:430. [PMID: 38671646 PMCID: PMC11049479 DOI: 10.3390/children11040430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Accepted: 03/24/2024] [Indexed: 04/28/2024]
Abstract
Nutrition is a modifiable factor of paramount importance for the prevention and attainment of health and the development of youngsters [...].
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Affiliation(s)
- Maria G. Grammatikopoulou
- Immunonutrition and Clinical Nutrition Unit, Department of Rheumatology and Clinical Immunology, Medical School, University of Thessaly, Biopolis Campus, GR-43100 Larissa, Greece
| | - Tonia Vassilakou
- Department of Public Health Policy, School of Public Health, University of West Attica, GR-11521 Athens, Greece
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Francese R, Peila C, Donalisio M, Lamberti C, Cirrincione S, Colombi N, Tonetto P, Cavallarin L, Bertino E, Moro GE, Coscia A, Lembo D. Viruses and Human Milk: Transmission or Protection? Adv Nutr 2023; 14:1389-1415. [PMID: 37604306 PMCID: PMC10721544 DOI: 10.1016/j.advnut.2023.08.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Revised: 07/14/2023] [Accepted: 08/15/2023] [Indexed: 08/23/2023] Open
Abstract
Human milk (HM) is considered the best source of nutrition for infant growth and health. This nourishment is unique and changes constantly during lactation to adapt to the physiological needs of the developing infant. It is also recognized as a potential route of transmission of some viral pathogens although the presence of a virus in HM rarely leads to a disease in an infant. This intriguing paradox can be explained by considering the intrinsic antiviral properties of HM. In this comprehensive and schematically presented review, we have described what viruses have been detected in HM so far and what their potential transmission risk through breastfeeding is. We have provided a description of all the antiviral compounds of HM, along with an analysis of their demonstrated and hypothesized mechanisms of action. Finally, we have also analyzed the impact of HM pasteurization and storage methods on the detection and transmission of viruses, and on the antiviral compounds of HM. We have highlighted that there is currently a deep knowledge on the potential transmission of viral pathogens through breastfeeding and on the antiviral properties of HM. The current evidence suggests that, in most cases, it is unnecessarily to deprive an infant of this high-quality nourishment and that the continuation of breastfeeding is in the best interest of the infant and the mother.
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Affiliation(s)
- Rachele Francese
- Department of Clinical and Biological Sciences, Laboratory of Molecular Virology and Antiviral Research, University of Turin, Orbassano (TO), Italy
| | - Chiara Peila
- Department of Public Health and Pediatrics, Neonatal Intensive Care Unit, University of Turin, Turin, Italy
| | - Manuela Donalisio
- Department of Clinical and Biological Sciences, Laboratory of Molecular Virology and Antiviral Research, University of Turin, Orbassano (TO), Italy
| | - Cristina Lamberti
- Institute of the Science of Food Production - National Research Council, Grugliasco, TO, Italy
| | - Simona Cirrincione
- Institute of the Science of Food Production - National Research Council, Grugliasco, TO, Italy
| | - Nicoletta Colombi
- Biblioteca Federata di Medicina "Ferdinando Rossi", University of Turin, Turin, Italy
| | - Paola Tonetto
- Department of Public Health and Pediatrics, Neonatal Intensive Care Unit, University of Turin, Turin, Italy
| | - Laura Cavallarin
- Institute of the Science of Food Production - National Research Council, Grugliasco, TO, Italy
| | - Enrico Bertino
- Department of Public Health and Pediatrics, Neonatal Intensive Care Unit, University of Turin, Turin, Italy
| | - Guido E Moro
- Italian Association of Human Milk Banks (AIBLUD), Milan, Italy.
| | - Alessandra Coscia
- Department of Public Health and Pediatrics, Neonatal Intensive Care Unit, University of Turin, Turin, Italy.
| | - David Lembo
- Department of Clinical and Biological Sciences, Laboratory of Molecular Virology and Antiviral Research, University of Turin, Orbassano (TO), Italy.
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Kemeter LM, Birzer A, Heym S, Thoma-Kress AK. Milk Transmission of Mammalian Retroviruses. Microorganisms 2023; 11:1777. [PMID: 37512949 PMCID: PMC10386362 DOI: 10.3390/microorganisms11071777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 07/02/2023] [Accepted: 07/05/2023] [Indexed: 07/30/2023] Open
Abstract
The transmission of viruses from one host to another typically occurs through horizontal or vertical pathways. The horizontal pathways include transmission amongst individuals, usually through bodily fluids or excretions, while vertical transmission transpires from mother to their offspring, either during pregnancy, childbirth, or breastfeeding. While there are more than 200 human pathogenic viruses to date, only a small number of them are known to be transmitted via breast milk, including cytomegalovirus (CMV), human immunodeficiency virus type 1 (HIV-1), and human T cell lymphotropic virus type 1 (HTLV-1), the latter two belonging to the family Retroviridae. Breast milk transmission is a common characteristic among mammalian retroviruses, but there is a lack of reports summarizing our knowledge regarding this route of transmission of mammalian retroviruses. Here, we provide an overview of the transmission of mammalian exogenous retroviruses with a focus on Orthoretrovirinae, and we highlight whether they have been described or suspected to be transmitted through breast milk, covering various species. We also elaborate on the production and composition of breast milk and discuss potential entry sites of exogenous mammalian retroviruses during oral transmission.
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Affiliation(s)
- Laura M Kemeter
- Institute of Clinical and Molecular Virology, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen, Germany
| | - Alexandra Birzer
- Institute of Clinical and Molecular Virology, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen, Germany
| | - Stefanie Heym
- Institute of Clinical and Molecular Virology, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen, Germany
| | - Andrea K Thoma-Kress
- Institute of Clinical and Molecular Virology, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen, Germany
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Neville MC, Demerath EW, Hahn-Holbrook J, Hovey RC, Martin-Carli J, McGuire MA, Newton ER, Rasmussen KM, Rudolph MC, Raiten DJ. Parental factors that impact the ecology of human mammary development, milk secretion, and milk composition-a report from "Breastmilk Ecology: Genesis of Infant Nutrition (BEGIN)" Working Group 1. Am J Clin Nutr 2023; 117 Suppl 1:S11-S27. [PMID: 37173058 PMCID: PMC10232333 DOI: 10.1016/j.ajcnut.2022.11.026] [Citation(s) in RCA: 18] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 11/22/2022] [Accepted: 11/29/2022] [Indexed: 05/15/2023] Open
Abstract
The goal of Working Group 1 in the Breastmilk Ecology: Genesis of Infant Nutrition (BEGIN) Project was to outline factors influencing biological processes governing human milk secretion and to evaluate our current knowledge of these processes. Many factors regulate mammary gland development in utero, during puberty, in pregnancy, through secretory activation, and at weaning. These factors include breast anatomy, breast vasculature, diet, and the lactating parent's hormonal milieu including estrogen, progesterone, placental lactogen, cortisol, prolactin, and growth hormone. We examine the effects of time of day and postpartum interval on milk secretion, along with the role and mechanisms of lactating parent-infant interactions on milk secretion and bonding, with particular attention to the actions of oxytocin on the mammary gland and the pleasure systems in the brain. We then consider the potential effects of clinical conditions including infection, pre-eclampsia, preterm birth, cardiovascular health, inflammatory states, mastitis, and particularly, gestational diabetes and obesity. Although we know a great deal about the transporter systems by which zinc and calcium pass from the blood stream into milk, the interactions and cellular localization of transporters that carry substrates such as glucose, amino acids, copper, and the many other trace metals present in human milk across plasma and intracellular membranes require more research. We pose the question of how cultured mammary alveolar cells and animal models can help answer lingering questions about the mechanisms and regulation of human milk secretion. We raise questions about the role of the lactating parent and the infant microbiome and the immune system during breast development, secretion of immune molecules into milk, and protection of the breast from pathogens. Finally, we consider the effect of medications, recreational and illicit drugs, pesticides, and endocrine-disrupting chemicals on milk secretion and composition, emphasizing that this area needs much more research attention.
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Affiliation(s)
- Margaret C Neville
- Department of Obstetrics and Gynecology, University of Colorado, Aurora, CO, USA.
| | - Ellen W Demerath
- Division of Epidemiology and Community Health, University of Minnesota, Minneapolis, MN, United States
| | - Jennifer Hahn-Holbrook
- Department of Psychological Sciences, University of California Merced, Merced, CA, United States
| | - Russell C Hovey
- Department of Animal Science, University of California Davis, Davis, CA, United States
| | - Jayne Martin-Carli
- Department of Pediatrics, University of Colorado, Aurora, CO, United States
| | - Mark A McGuire
- Idaho Agricultural Experiment Station, University of Idaho, Moscow, ID, United States
| | - Edward R Newton
- Department of Obstetrics and Gynecology, Brody School of Medicine, East Carolina University, Greenville, NC, United States
| | - Kathleen M Rasmussen
- Nancy Schlegel Meinig Professor of Maternal and Child Nutrition, Division of Nutritional Sciences, Cornell University, Ithaca, NY, United States
| | - Michael C Rudolph
- The University of Oklahoma Health Science Center, Oklahoma City, OK, United States
| | - Daniel J Raiten
- Pediatric Growth and Nutrition Branch, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, United States
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Van de Perre P, Molès JP, Rollins N. Is monkeypox virus transmissible by breastfeeding? Pediatr Allergy Immunol 2022; 33:e13861. [PMID: 36282140 DOI: 10.1111/pai.13861] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 09/14/2022] [Accepted: 09/16/2022] [Indexed: 11/23/2022]
Affiliation(s)
- Philippe Van de Perre
- Pathogenesis and Control of Chronic and Emerging Infections, INSERM, Univ Montpellier, Etablissement Français du Sang, Univ Antilles, Montpellier, France
| | - Jean-Pierre Molès
- Pathogenesis and Control of Chronic and Emerging Infections, INSERM, Univ Montpellier, Etablissement Français du Sang, Univ Antilles, Montpellier, France
| | - Nigel Rollins
- Department of Maternal, Newborn, Child and Adolescent Health and Ageing, World Health Organization, Geneva, Switzerland
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Liu X, Chen H, An M, Yang W, Wen Y, Cai Z, Wang L, Zhou Q. Recommendations for breastfeeding during Coronavirus Disease 2019 (COVID-19) pandemic. Int Breastfeed J 2022; 17:28. [PMID: 35410357 PMCID: PMC8995694 DOI: 10.1186/s13006-022-00465-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 03/12/2022] [Indexed: 11/21/2022] Open
Abstract
Background Coronavirus Disease 2019 (COVID-19) has spread worldwide. The safety of breastfeeding of SARS-CoV-2-positive women has not yet reached a consensus among the scientific community, healthcare providers, experts in lactation care, health organizations and governments. This study was conducted to summarize the latest evidence about the safety of breastfeeding among suspected/confirmed infected mothers and to summarize the recommendations on breastfeeding during COVID-19 from different organizations. Methods A comprehensive literature review of publications about the safety of breastfeeding among SARS-CoV-2-infected mothers was conducted. Scientific databases were searched up to 26 May 2021. The evidence was summarized into five perspectives according to a framework proposed by van de Perre et al. with certain modifications. Moreover, websites of different health organizations were visited to gather the recommendations for breastfeeding. Results The current evidence demonstrated that the majority of infants breastfed by infected mothers were negative for SARS-CoV-2. Breast milk samples from suspected/infected mothers mainly demonstrated negative results in SARS-CoV-2 viral tests. There was insufficient evidence proving the infectivity of breast milk from infected mothers. Recent studies found other transmission modalities (e.g., milk containers, skin) associated with breastfeeding. Specific antibodies in the breast milk of infected mothers were also found, implying protective effects for their breastfed children. According to van de Perre’s criteria, the breast milk of infected mothers was unlikely to transmit SARS-CoV-2. Owing to the low quality of the current evidence, studies with a more robust design are needed to strengthen the conclusion regarding the safety of breastfeeding. Further studies to follow up the health status of infants who were directly breastfed by their suspected/infected mothers, to collect breast milk samples at multiple time points for viral tests and to examine specific antibodies in breast milk samples are warranted. Current recommendations on breastfeeding during COVID-19 from different organizations are controversial, while direct breastfeeding with contact precautions is generally suggested as the first choice for infected mothers. Conclusions This review determined the safety of breastfeeding and identified the focus for further research during the COVID-19 pandemic. Recommendations on breastfeeding are suggested to be updated in a timely manner according to the latest evidence.
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Impact of the Coronavirus Disease (COVID-19) Pandemic on Neonatal Nutrition: Focus on Low- and Middle-Income Countries. CURRENT TROPICAL MEDICINE REPORTS 2022; 9:218-224. [PMID: 36415223 PMCID: PMC9672601 DOI: 10.1007/s40475-022-00272-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/22/2022] [Indexed: 11/19/2022]
Abstract
Purpose of Review This review serves to account for the published literature regarding the changing impact of the COVID-19 pandemic with a focus on neonatal nutrition in low- and middle-income countries. Recent Findings Initial national and international guidelines regarding breastfeeding were often contradictory. Lack of clear guidelines resulted in separation of mother-neonate dyads and the reliance on non-human sources of milk at institutional levels. Mothers and families were less likely to initiate and/or continue breastfeed during the pandemic due to confusion regarding guidelines, lack of support for lactation, and concern for infection transmission to their neonates. Continued research in neonatal nutrition, however, continues to support the use of breastmilk as the optimal nutritional source for neonates. Summary Despite concerns for increased risk of COVID-19 transmission with breastfeeding, the use of breastmilk with preserved and combined mother-baby care is associated with improved neonatal nutrition.
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Clinical, Virologic and Immunologic Correlates of Breast Milk Acquired Cytomegalovirus (CMV) Infections in Very Low Birth Weight (VLBW) Infants in a Newborn Intensive Care Unit (NICU) Setting. Viruses 2021; 13:v13101897. [PMID: 34696327 PMCID: PMC8539954 DOI: 10.3390/v13101897] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 09/03/2021] [Accepted: 09/09/2021] [Indexed: 01/01/2023] Open
Abstract
Cytomegalovirus (CMV) infections acquired by very-low-birthweight (VLBW) infants are incompletely characterized. To examine CMV transmission in VLBW infants, we evaluated maternal DNAlactia, infant DNAemia, and presence of clinical disease in a blinded study in VLBW infants in our newborn intensive care unit (NICU). To examine these issues, 200 VLBW infants were enrolled in a surveillance study, with weekly breast milk and infant whole blood samples collected, as available. Virologic (breast milk and infant whole blood real time PCR) and immunologic (IgG, IgM, and IgG avidity) correlates were evaluated. A chart review examined whether infants had symptoms compatible with CMV disease. DNAlactia was identified in 65/150 (43%) of lactating mothers. Nine CMV infections were identified in 9/75 CMV-exposed infants (12% of exposed infants). A higher median breast milk viral load (DNAlactia) correlated with an increased likelihood of DNAemia (p = 0.05). Despite potential symptoms compatible with CMV infection, clinicians had not considered the diagnosis of CMV in 6/9 cases (66%). All of these infants had chronic lung disease at discharge. There was no correlation between IgG antibody titer or IgG avidity index and the likelihood of transmission or CMV disease. In conclusion, in VLBW infants receiving milk from seropositive mothers, CMV infections are commonly acquired, and are frequently unrecognized. Future studies are needed to determine whether routine surveillance for CMV of either breast milk or infant plasma is beneficial in preventing or recognizing infection.
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Desgraupes S, Hubert M, Gessain A, Ceccaldi PE, Vidy A. Mother-to-Child Transmission of Arboviruses during Breastfeeding: From Epidemiology to Cellular Mechanisms. Viruses 2021; 13:1312. [PMID: 34372518 PMCID: PMC8310101 DOI: 10.3390/v13071312] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 06/18/2021] [Accepted: 06/30/2021] [Indexed: 12/20/2022] Open
Abstract
Most viruses use several entry sites and modes of transmission to infect their host (parenteral, sexual, respiratory, oro-fecal, transplacental, transcutaneous, etc.). Some of them are known to be essentially transmitted via arthropod bites (mosquitoes, ticks, phlebotomes, sandflies, etc.), and are thus named arthropod-borne viruses, or arboviruses. During the last decades, several arboviruses have emerged or re-emerged in different countries in the form of notable outbreaks, resulting in a growing interest from scientific and medical communities as well as an increase in epidemiological studies. These studies have highlighted the existence of other modes of transmission. Among them, mother-to-child transmission (MTCT) during breastfeeding was highlighted for the vaccine strain of yellow fever virus (YFV) and Zika virus (ZIKV), and suggested for other arboviruses such as Chikungunya virus (CHIKV), dengue virus (DENV), and West Nile virus (WNV). In this review, we summarize all epidemiological and clinical clues that suggest the existence of breastfeeding as a neglected route for MTCT of arboviruses and we decipher some of the mechanisms that chronologically occur during MTCT via breastfeeding by focusing on ZIKV transmission process.
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Affiliation(s)
- Sophie Desgraupes
- Unité Épidémiologie et Physiopathologie des Virus Oncogènes, Département Virologie, Institut Pasteur, 75015 Paris, France; (M.H.); (A.G.); (P.-E.C.)
- Université de Paris, 75013 Paris, France
- UMR Centre National de la Recherche Scientifique 3569, Institut Pasteur, 75015 Paris, France
| | - Mathieu Hubert
- Unité Épidémiologie et Physiopathologie des Virus Oncogènes, Département Virologie, Institut Pasteur, 75015 Paris, France; (M.H.); (A.G.); (P.-E.C.)
- Université de Paris, 75013 Paris, France
- UMR Centre National de la Recherche Scientifique 3569, Institut Pasteur, 75015 Paris, France
| | - Antoine Gessain
- Unité Épidémiologie et Physiopathologie des Virus Oncogènes, Département Virologie, Institut Pasteur, 75015 Paris, France; (M.H.); (A.G.); (P.-E.C.)
- Université de Paris, 75013 Paris, France
- UMR Centre National de la Recherche Scientifique 3569, Institut Pasteur, 75015 Paris, France
| | - Pierre-Emmanuel Ceccaldi
- Unité Épidémiologie et Physiopathologie des Virus Oncogènes, Département Virologie, Institut Pasteur, 75015 Paris, France; (M.H.); (A.G.); (P.-E.C.)
- Université de Paris, 75013 Paris, France
- UMR Centre National de la Recherche Scientifique 3569, Institut Pasteur, 75015 Paris, France
| | - Aurore Vidy
- Unité Épidémiologie et Physiopathologie des Virus Oncogènes, Département Virologie, Institut Pasteur, 75015 Paris, France; (M.H.); (A.G.); (P.-E.C.)
- Université de Paris, 75013 Paris, France
- UMR Centre National de la Recherche Scientifique 3569, Institut Pasteur, 75015 Paris, France
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Van de Perre P, Molès J, Nagot N, Tuaillon E, Ceccaldi P, Goga A, Prendergast AJ, Rollins N. Revisiting Koch's postulate to determine the plausibility of viral transmission by human milk. Pediatr Allergy Immunol 2021; 32:835-842. [PMID: 33594740 PMCID: PMC8359252 DOI: 10.1111/pai.13473] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 02/09/2021] [Accepted: 02/12/2021] [Indexed: 12/18/2022]
Abstract
As breastfeeding is of utmost importance for child development and survival, identifying whether breast milk is a route of transmission for human viruses is critical. Based on the principle of Koch's postulate, we propose an analytical framework to determine the plausibility of viral transmission by breast milk. This framework is based on five criteria: viral infection in children receiving breast milk from infected mothers; the presence of virus, viral antigen, or viral genome in the breast milk of infected mothers; the evidence for the virus in breast milk being infectious; the attempts to rule out other transmission modalities; and the reproduction of viral transmission by oral inoculation in an animal model. We searched for evidence in published reports to determine whether the 5 criteria are fulfilled for 16 human viruses that are suspected to be transmissible by breast milk. We considered breast milk transmission is proven if all 5 criteria are fulfilled, as probable if 4 of the 5 criteria are met, as possible if 3 of the 5 criteria are fulfilled, and as unlikely if less than 3 criteria are met. Only five viruses have proven transmission through breast milk: human T-cell lymphotropic virus 1, human immunodeficiency virus, human cytomegalovirus, dengue virus, and Zika virus. The other 11 viruses fulfilled some but not all criteria and were categorized accordingly. Our framework analysis is useful for guiding public health recommendations and for identifying knowledge gaps amenable to original experiments.
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Affiliation(s)
- Philippe Van de Perre
- Pathogenesis and Control of Chronic and Emerging InfectionsUniversity of MontpellierINSERMEtablissement Français du SangAntilles UniversityMontpellierFrance
- CHU MontpellierMontpellierFrance
| | - Jean‐Pierre Molès
- Pathogenesis and Control of Chronic and Emerging InfectionsUniversity of MontpellierINSERMEtablissement Français du SangAntilles UniversityMontpellierFrance
- CHU MontpellierMontpellierFrance
| | - Nicolas Nagot
- Pathogenesis and Control of Chronic and Emerging InfectionsUniversity of MontpellierINSERMEtablissement Français du SangAntilles UniversityMontpellierFrance
- CHU MontpellierMontpellierFrance
| | - Edouard Tuaillon
- Pathogenesis and Control of Chronic and Emerging InfectionsUniversity of MontpellierINSERMEtablissement Français du SangAntilles UniversityMontpellierFrance
- CHU MontpellierMontpellierFrance
| | - Pierre‐Emmanuel Ceccaldi
- Unité Epidémiologie et Physiopathologie des Virus OncogènesCNRS UMR 3569Institut PasteurUniversité de ParisParisFrance
| | - Ameena Goga
- HIV Prevention Research UnitSouth African Medical Research CouncilCape TownSouth Africa
- Department of Paediatrics and Child HealthUniversity of PretoriaPretoriaSouth Africa
| | - Andrew J. Prendergast
- Blizard InstituteQueen Mary University of LondonUK
- Zvitambo Institute for Maternal and Child Health ResearchHarareZimbabwe
| | - Nigel Rollins
- Department of Maternal, Newborn, Child and Adolescent Health and AgeingWorld Health OrganizationGenevaSwitzerland
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