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Inoue J, Weber D, Fernandes JF, Adegnika AA, Agnandji ST, Lell B, Kremsner PG, Grobusch MP, Mordmüller B, Held J. HHV-6 infections in hospitalized young children of Gabon. Infection 2023; 51:1759-1765. [PMID: 37501013 PMCID: PMC10665219 DOI: 10.1007/s15010-023-02077-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 07/15/2023] [Indexed: 07/29/2023]
Abstract
PURPOSE Fever is a common cause for hospitalization among the pediatric population. The spectrum of causative agents is diverse. Human herpesvirus 6 (HHV-6) is a ubiquitous virus that often causes hospitalization of children in western countries. Previously, we investigated the cause of fever of 600 febrile hospitalized children in Gabon, and in 91 cases the causative pathogen was not determined. In this study, we assessed HHV-6 infection as potential cause of hospitalization in this group. METHODS Blood samples were assessed for HHV-6 using real-time quantitative PCR. Three groups were investigated: (1) group of interest: 91 hospitalized children with febrile illness without a diagnosed causing pathogen; (2) hospitalized control: 91 age-matched children hospitalized with febrile illness with a potentially disease-causing pathogen identified; both groups were recruited at the Albert Schweitzer Hospital in Lambaréné, Gabon and (3) healthy control: 91 healthy children from the same area. RESULTS Samples from 273 children were assessed. Age range was two months to 14 years, median (IQR) age was 36 (12-71) months; 52% were female. HHV-6 was detected in 64% (58/91), 41% (37/91), and 26% (24/91) of the samples from groups 1, 2, and 3, respectively; with statistically significant odds of being infected with HHV-6 in group 1 (OR = 4.62, 95% CI [2.46, 8.90]). Only HHV-6B was detected. CONCLUSIONS Although tropical diseases account for a large proportion of children's hospitalizations, considering common childhood diseases such as HHV-6 when diagnosing febrile illnesses in pediatric populations in tropical countries is of importance.
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Affiliation(s)
- Juliana Inoue
- Institute of Tropical Medicine, Eberhard Karls University Tübingen, Tübingen, Germany
| | - David Weber
- Institute of Tropical Medicine, Eberhard Karls University Tübingen, Tübingen, Germany
| | - José Francisco Fernandes
- Institute of Tropical Medicine, Eberhard Karls University Tübingen, Tübingen, Germany
- Centre de Recherches Médicales de Lambaréné (CERMEL), Lambaréné, Gabon
- German Center for Infection Research (DZIF), Partner Site Tübingen, Tübingen, Germany
- Centre of Tropical Medicine and Travel Medicine, Department of Infectious Diseases, Amsterdam Infection & Immunity, Amsterdam Public Health, Amsterdam University Medical Centres, Location University of Amsterdam, Amsterdam, The Netherlands
| | - Ayola Akim Adegnika
- Institute of Tropical Medicine, Eberhard Karls University Tübingen, Tübingen, Germany
- Centre de Recherches Médicales de Lambaréné (CERMEL), Lambaréné, Gabon
- German Center for Infection Research (DZIF), Partner Site Tübingen, Tübingen, Germany
| | - Selidji Todagbe Agnandji
- Institute of Tropical Medicine, Eberhard Karls University Tübingen, Tübingen, Germany
- Centre de Recherches Médicales de Lambaréné (CERMEL), Lambaréné, Gabon
- German Center for Infection Research (DZIF), Partner Site Tübingen, Tübingen, Germany
| | - Bertrand Lell
- Centre de Recherches Médicales de Lambaréné (CERMEL), Lambaréné, Gabon
- Department of Medicine I, Division of Infectious Diseases and Tropical Medicine, Medical University of Vienna, Vienna, Austria
| | - Peter G Kremsner
- Institute of Tropical Medicine, Eberhard Karls University Tübingen, Tübingen, Germany
- Centre de Recherches Médicales de Lambaréné (CERMEL), Lambaréné, Gabon
- German Center for Infection Research (DZIF), Partner Site Tübingen, Tübingen, Germany
| | - Martin Peter Grobusch
- Institute of Tropical Medicine, Eberhard Karls University Tübingen, Tübingen, Germany
- Centre de Recherches Médicales de Lambaréné (CERMEL), Lambaréné, Gabon
- Centre of Tropical Medicine and Travel Medicine, Department of Infectious Diseases, Amsterdam Infection & Immunity, Amsterdam Public Health, Amsterdam University Medical Centres, Location University of Amsterdam, Amsterdam, The Netherlands
- Institute of Infectious Diseases and Molecular Medicine, University of Cape Town, Cape Town, South Africa
- Masanga Medical Research Unit, Masanga, Sierra Leone
| | - Benjamin Mordmüller
- Institute of Tropical Medicine, Eberhard Karls University Tübingen, Tübingen, Germany
- Centre de Recherches Médicales de Lambaréné (CERMEL), Lambaréné, Gabon
- Department of Medical Microbiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Jana Held
- Institute of Tropical Medicine, Eberhard Karls University Tübingen, Tübingen, Germany.
- German Center for Infection Research (DZIF), Partner Site Tübingen, Tübingen, Germany.
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Comparability of CMV DNA Extraction Methods and Validation of Viral Load. Methods Protoc 2022; 5:mps5010006. [PMID: 35076560 PMCID: PMC8788495 DOI: 10.3390/mps5010006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 12/06/2021] [Accepted: 12/23/2021] [Indexed: 12/04/2022] Open
Abstract
Human cytomegalovirus is a herpesvirus that has a worldwide seroprevalence of more than 60% of adults in developed countries and 90% in developing countries. Severe disabilities in newborns are characteristic of the human cytomegalovirus congenital infection, and this virus is implicated in graft rejection in transplant patients. To treat and follow-up the infection, the CMVPCR viral loads are required, and the DNA extraction step remains very important; however, the quantity, quality, and purity of extracted DNA from different biological fluids influence the results of PCR amplification, that is why for reliable results, the choice of nucleic acid extraction methods requires careful attention. Materials and methods: In this study, we compare 4 protocols, I (EZ1 DSP Virus kit), II (EZ1 Virus mini kit), III (QIAamp DSP virus kit), and IV (heating); the extractions are made from plasma collected on EDTA tubes, and the concentration of extracted DNA was measured on NanoDrop Lite followed by real-time CMVPCR using an Artus CMV QS-RGQ kit. All protocols are performed following the manufacturer’s instructions. Results: This study is conducted on the samples of 135 transplant patients whose follow-up medical tests related to human cytomegalovirus infection; since most of the CMVPCR results are negative, we have chosen the 10 CMVPCR positive samples and 2 negative samples as controls to conduct this comparison study. By using NanoDrop Lite to evaluate the DNA concentration, the yield of extracted DNA is higher in our heating protocol than other protocols, the EZ1 DSP virus kit and EZ1 Virus mini kit show homogeneous quantities, and the QIAamp DSP virus kit shows very low DNA yields. Comparing cycle threshold and viral loads by real-time PCR, all these protocols identified negative samples (100%), and the previously positive samples used were as follows: protocol IV (90%), protocol II (60%), and protocol I (40%). QIAamp DSP virus kit results were not real-time PCR applicable and were non-conclusive because of the low DNA yields. Conclusion: Our developed heating method (protocol IV) is very effective, reliable, simple, fast, and cheap compared to the other protocols in our study.
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