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© K. Stapleford, M. Vignuzzi, I. Bonne, C. Schmitt, J-M. Panaud
Chikungunya virus emerging from infected C6/36 mosquito cells (Aedes albopictus)
Publication : Frontiers in cellular and infection microbiology

Exploring Zebrafish Larvae as a COVID-19 Model: Probable Abortive SARS-CoV-2 Replication in the Swim Bladder.

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Frontiers in cellular and infection microbiology - 01 Jan 2022

Laghi V, Rezelj V, Boucontet L, Frétaud M, Da Costa B, Boudinot P, Salinas I, Lutfalla G, Vignuzzi M, Levraud JP,

Link to Pubmed [PMID] – 35360100

Link to DOI – 10.3389/fcimb.2022.790851

Front Cell Infect Microbiol 2022 ; 12(): 790851

Animal models are essential to understanding COVID-19 pathophysiology and for preclinical assessment of drugs and other therapeutic or prophylactic interventions. We explored the small, cheap, and transparent zebrafish larva as a potential host for SARS-CoV-2. Bath exposure, as well as microinjection in the coelom, pericardium, brain ventricle, or bloodstream, resulted in a rapid decrease of SARS-CoV-2 RNA in wild-type larvae. However, when the virus was inoculated in the swim bladder, viral RNA stabilized after 24 h. By immunohistochemistry, epithelial cells containing SARS-CoV-2 nucleoprotein were observed in the swim bladder wall. Our data suggest an abortive infection of the swim bladder. In some animals, several variants of concern were also tested with no evidence of increased infectivity in our model. Low infectivity of SARS-CoV-2 in zebrafish larvae was not due to the host type I interferon response, as comparable viral loads were detected in type I interferon-deficient animals. A mosaic overexpression of human ACE2 was not sufficient to increase SARS-CoV-2 infectivity in zebrafish embryos or in fish cells in vitro. In conclusion, wild-type zebrafish larvae appear mostly non-permissive to SARS-CoV-2, except in the swim bladder, an aerial organ sharing similarities with the mammalian lung.

https://pubmed.ncbi.nlm.nih.gov/35360100