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Serial photographs of infected ECV304 cells in medium containing chloramphenicol (see Fig. 1 for details) (×200). In the Boryong strain-infected cells, the highest concentrations of chloramphenicol at which IF-positive foci are observed are 40, 100, and 100 µg/mL on days 5, 13, and 28, respectively. In the AFSC-4 strain-infected cells, the highest concentration is 100 µg/mL on days 5, 13, and 28.
