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Plaque formation by clinical isolates of influenza A2-Hong Kong.

Human conjunctival cell variant (clone 1-5C-4) has been previously shown to be the only established cell line to support plaque formation by laboratory strains of influenza viruses. The present study describes characteristic plaque formation in clone 1-5C-4 by unadapted clinical isolates of influenza A2/Hong Kong. It is concluded that this technic may provide an additional diagnostic tool for clinical virology laboratories.