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Najimi N, Tajount L, Regragui Z, Remz C, Ait-Lhaj-Mhand R, Kadi C, Belayachi L, Seghrouchni F, Nadia dakka, El Hassani RA, Elharti E, Oumzil H, Bakri Y. Pre-pandemic antibodies screening against SARS-CoV-2 and virus detection among children diagnosed with eruptive fevers. Int J Immunopathol Pharmacol 2024; 38:3946320241260633. [PMID: 38836458 PMCID: PMC11155355 DOI: 10.1177/03946320241260633] [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: 12/15/2023] [Accepted: 05/22/2024] [Indexed: 06/06/2024] Open
Abstract
OBJECTIVES This study aims to assess the seroprevalence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) IgG antibodies against the spike (S) and nucleocapsid (NP) proteins, as well as neutralizing antibodies against the receptor-binding domain (RBD). Additionally, it aims to detect viral RNA of SARS-CoV-2 in pre-pandemic archival pediatric specimens collected before the announcement of the COVID-19 pandemic spread on March 20th, 2020, in Morocco. The objective is to investigate the existence of pre-pandemic immunity to SARS-CoV-2. METHODS We conducted a cross-sectional study, to analyze IgG antibody levels in a cohort of 106 pre-pandemic pediatric participants. Using an indirect enzyme-linked immunosorbent assay (ELISA), we measured the IgG levels against the S and NP proteins of SARS-CoV-2. Additionally, we staged a competitive ELISA assay to evaluate the neutralizing capability of these antibodies. We used reverse transcription polymerase chain reaction (rRT-PCR) to detect viral NP and ORF1ab genes of SARS-CoV-2 in oropharyngeal swabs. Moreover, we conducted on the same specimens a multiplexed RT-PCR to detect RNA of the most common 27 pathogens involved in lower respiratory tract infections. RESULTS Among the 106 serum samples, 13% (nn = =14) tested positive for SARS-CoV-2 IgG antibodies using ELISA. Temporal analysis indicated varying IgG positivity levels across 2019. Neutralizing antibodies were found in 21% of the 28 samples analyzed, including two with high inhibition rates (93%). The SARS-CoV-2 RNA was detected using rRT-PCR in 14 samples. None of the samples tested positive for the other 27 pathogens associated with lower respiratory tract infections, using multiplexed RT-PCR. CONCLUSION Our study addresses the possibility, that COVID-19 infections occurred in Morocco before the recognized outbreak. On the other hand, some of the cases might reflect cross-reactivity with other coronaviruses or be influenced by previous viral exposures or vaccinations. Understanding these factors is crucial to comprehending pediatric immune responses to newly emerging infectious diseases.
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Affiliation(s)
- Nouhaila Najimi
- Laboratory of Human Pathologies Biology, Faculty of Sciences, Mohammed V University in Rabat, Rabat, Morocco
- Mohammed VI Center for Research & Innovation, Rabat, Morocco and Mohammed VI University of Sciences and Health, Casablanca, Morocco
| | - Latifa Tajount
- Laboratory of Spectroscopy, Molecular Modeling, Materials, Nanomaterials, Water and Environment, Materials for Environment Team, ENSAM, Mohammed V University in Rabat, Rabat, Morocco
| | - Zakia Regragui
- Virology Department, Institut National d’Hygiène, Rabat, Morocco
| | - Chaimae Remz
- Virology Department, Institut National d’Hygiène, Rabat, Morocco
| | | | - Chaimae Kadi
- Mohammed VI Center for Research & Innovation, Rabat, Morocco and Mohammed VI University of Sciences and Health, Casablanca, Morocco
- Laboratory of Biology and Health, Faculty of Sciences of Tetouan, Abdelmalek Essaadi University, Tetouan, Morocco
| | - Lamiae Belayachi
- International University of Rabat (UIR), Faculty of Medicine, Centre de Recherche en Sciences de la Santé (CreSS), Faculty of Medecine, Health Sciences Research Centre (CReSS), International University of Rabat (UIR), Rabat, Morocco
| | - Fouad Seghrouchni
- Mohammed VI Center for Research & Innovation, Rabat, Morocco and Mohammed VI University of Sciences and Health, Casablanca, Morocco
| | - Nadia dakka
- Laboratory of Human Pathologies Biology, Faculty of Sciences, Mohammed V University in Rabat, Rabat, Morocco
- Center of Genomic of Human Pathologies Biology Faculty of Medicine, Mohammed V University in Rabat, Rabat, Morocco
| | - Rabii Ameziane El Hassani
- Laboratory of Human Pathologies Biology, Faculty of Sciences, Mohammed V University in Rabat, Rabat, Morocco
- Center of Genomic of Human Pathologies Biology Faculty of Medicine, Mohammed V University in Rabat, Rabat, Morocco
| | - Elmir Elharti
- Virology Department, Institut National d’Hygiène, Rabat, Morocco
| | - Hicham Oumzil
- Center of Genomic of Human Pathologies Biology Faculty of Medicine, Mohammed V University in Rabat, Rabat, Morocco
- Medical Biotechnology Laboratory, Faculty of Medicine at Mohammed V University in Rabat, Rabat, Morocco
| | - Youssef Bakri
- Laboratory of Human Pathologies Biology, Faculty of Sciences, Mohammed V University in Rabat, Rabat, Morocco
- Center of Genomic of Human Pathologies Biology Faculty of Medicine, Mohammed V University in Rabat, Rabat, Morocco
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Alaoui-Inboui FZ, Bouchra S. Viral Bronchiolo-Alveolitis From Coronavirus OC43 and Rhinovirus-Simulating SARS-CoV-2 Infection. Cureus 2022; 14:e28093. [PMID: 36127976 PMCID: PMC9478778 DOI: 10.7759/cureus.28093] [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] [Accepted: 08/16/2022] [Indexed: 12/01/2022] Open
Abstract
Viruses are the most common cause of acute lower respiratory tract. The respiratory syncytial virus infection is most commonly associated with viral bronchiolitis. Rhinovirus and coronavirus OC43 are less frequently responsible for lower respiratory tract infections. The virological spectrum has expanded greatly owing to the development of molecular biology techniques. We report the clinical case of a four-month-old infant who presented with acute lower respiratory infection with coronavirus OC43 (HCoV-OC43) and rhinovirus complicated by a particularly extensive spontaneous pneumomediastinum.
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