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Single-step growth curves for enterovirus isolates in HEp-2 cells. Single-step growth of all six isolates (isolate 1 [●], isolate 2 [○], isolate 3 [■], isolate 4 [□], isolate 5 [▴], and isolate 6 [▵]) was measured under the infection and culture conditions described in Materials and Methods. The curves were plotted based on duplicate results for each isolate.
