The following search terms were used (alone or in combination): zebrafish, SARS-CoV-2, COVID-19, CNS, encephalitis, neurologic disorders, anosmia, ciliopathy, olfactory system, olfactory bulb, olfactory neurons, ACE2, TMPRSS2, immunity, behavior, genetic manipulation, imaging tools, molecular analysis, biochemical analysis, omics. This evidence concerns the gene TMPRSS2 and viral encephalitis.