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Central Virus Diagnostic Laboratory, National Institute of Health, Musashimurayama-shi, Tokyo 190-12, Japan
Replication of the strain J 670/71 of enterovirus 70 (EV70) in non-primate cell cultures at 33 °C was studied using strain L (mouse), BHK21 (hamster), RK13 (rabbit), RK17 (rabbit), PK15 (porcine), IB-RS-2 (porcine), ESK (porcine), MDBK (bovine), and BK1 (primary bovine) together with that of the LSc, 2ab strain of poliovirus type 1 (PV1) as a control. All the cells tested adsorbed from 54 to 90% of EV70. The replication with complete c.p.e. was evident in RK13, RK17 and BK1 cells; replication without c.p.e. was shown in L, BHK21, IB-RS-2 and ESK; but PK15 and MDBK were non-permissive despite a high virus adsorption rate. On the contrary, none of these non-primate cells allowed the adsorption and growth of PV1. One-step growth of EV70 in RK13 was almost identical with that in the primate cells. Two other strains of EV70 were found having similar host range in vitro. Therefore, it is concluded that EV70 has a wider host range in vitro than ordinary human enteroviruses, and its implication is discussed.
Received 1 March 1977;
accepted 19 April 1977.
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