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Human coronavirus NL63 (HCoV-NL63), a recently discovered member of the Coronaviridae family, has spread worldwide and is associated with acute respiratory illness in young children and elderly and immunocompromised persons. Further analysis of HCoV-NL63 pathogenicity seems warranted, in particular because the virus uses the same cellular receptor as severe acute respiratory syndrome-associated coronavirus. As there is currently no HCoV-NL63-specific and effective vaccine or drug therapy available, we evaluated several existing antiviral drugs and new synthetic compounds as inhibitors of HCoV-NL63, targeting multiple stages of the replication cycle. Of the 28 compounds that we tested, 6 potently inhibited HCoV-NL63 at early steps of the replication cycle. Intravenous immunoglobulins, heptad repeat 2 peptide, small interfering RNA1 (siRNA1), siRNA2, beta-D-N(4)-hydroxycytidine, and 6-azauridine showed 50% inhibitory concentrations of 125 microg/ml, 2 microM, 5 nM, 3 nM, 400 nM, and 32 nM, respectively, and low 50% cytotoxicity concentrations (&gt;10 mg/ml, &gt;40 microM, &gt;200 nM, &gt;200 nM, &gt;100 microM, and 80 microM, respectively). These agents may be investigated further for the treatment of coronavirus infections.

Inhibition of Human Coronavirus NL63 Infection at Early Stages of the Replication Cycle