Abstract
Anti-malaria drug, chloroquine, has been reported to be effective against influenza A virus (IAV) in vitro and used in in-vivo experiments and clinical trial for prevention or treatment of influenza. In this study, it has been shown by immunofluorescence, hemagglutination, and plaque assays that chloroquine enhanced A/WSN/33 (H1N1) replication with pronounced cytopathic effect in dose-, time-, and MOI-dependent manners in human lung epithelial cells A549. Time-of-addition assay showed that inhibitory effect on virus replication by chloroquine pre-treatment was indistinctive, and virus productions were enhanced when the drug was applied after viral adsorption. The effectiveness of chloroquine as an anti-influenza drug is questioned, and caution in its use is recommended.
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